6926475860

Vol. 36(2), 2001

could be considered as a subfamily of Potamididae.

In comparison with the data on Cerithidea califomica given by Bright (1958; 1960), C. costata differs in having esophageal crop absent, duet to digestive gland inserting in stornach (and not in distal extremity of esophagus), opened pallia) oviduct and bursa copulatrix present. Driscoll (1972) presents a detailed study on digestive system of C. californica, in which the stornach of C. costata, in particular, is very similar, differs in lacking the ridges near intestine origin.

Family Campanilidac Genus Campanile Fischer, 1884 (iype species: Cerithium giganteum Lamarck,

1804 [Eocene])

Campanile symbolicum lredale, 1917 (Figs 42, 81, 111,406-422)

Synonymy see Houbrick (198la: 282). Complement:

Campanile symbolicum; Abbott & Dance, 1983: 68 (fig.).

Description.

Shell (fig. 42). Relatively large (morę than 240 mm), tumform, heavy, thick walled. Whorls with almost straight outer surface, suture almost invisible, Periostracum white, calcified. Other details in Houbrick (198 la: 266-268, figs. 1-2).

Head-foot (figs 406, 408, 411). Homogeneous beige in color. Head protruding. Snout relatively smali, cylindrical, with a deep anterior, ventral, longitudinal, furrow. Tentacles somewhat long, broad, dorso-ventrally flattened. Eyes dark, on smali ommatophores situated approximately in middle-outer region of tentacles. Foot laige (about 1/3 whorl); fuirow of pedał glands deep, with thick borders in anterior margin, gradually becomes narrow in lateral region, surrounds en tire foot sole. Columellar muscle long, about 2.5 whorls, flattened and thick. Other details in Houbrick (1981a: 268-271, figs. 3a, b, 4a). Dorsal wali of haemocoel thick muscular in anterior half; posterior half thinner; separating both regions a diaphragm-like septum surrounding esophagus (fig. 411: o 1).

Operculum. Sub-circular, comeus, sub-cen-tral nucleus, palcispiral; occupies paitially aperture (fig.408) (see also Houbrick, 198la: 268, figs le-f).

Mantle organs (figs 407, 410, 412, 422). Mantle border entirely with smali papillae, somewhat uniform in size; in region of siphonal canal a deep concavity. Mantle cavity very deep, morę than 2 whorls. Osphradium long, bipectinate, somewhat elliptical outline; length little morę than 1/3 of gili length; filaments very thin and close with cach other, right filaments larger and discretely morę numerous than left filaments; right filaments attached to ctenidial vein and probably irrigating to it; left margin free; dorsal surface of osphradium altogether attached to mantle (fig. 422). Gili long, little morę than half of cavity, narrow, filaments triangular tali, tip pointed, almost central; gili begins relatively posterior fforn mantle border. Ctenidial vein broad sińce anterior gili margin, about 1/3 of its length (posterior) ffee from gili, running at left in fioor of pallial cavity, close kidney. Between gili and rectum a relatively broad space; in posterior 2/3 of this space several transverse vessels, sometimes dichotomic, inserted in an inconspicuous ad-rectal sinus. Hypobranchial glands a lamina covering vessels between gili and rectum; some specimens bearing a tali fold lying anterior half of rectum. Rectum described below. Anus siphoned, very posterior from mantle border. Other details in Houbrick (1981 a: 271-274, figs 3c, 4a, b).

Circulatory and excretory systems (figs 407, 409, 410). Heart similar to those of preceding species, proportionally smali, anterior and posterior aortas not attached directly in stornach, but in a lobe of digestive gland. Kidney very long, morę than half whorl, somewhat flattened, brown in color. Anterior-pallial half of kidney almost solid, bearing several glandular septa radially disposed; nephrostome a slit near posterior limit of pallial cavity. Posterior-visceral half of kidney with two regions, that at left lying pericardium, almost solid, bearing several transversal glandular septa; that at right replete of several vessels close with each other, connected in a main vessel which runs in median region (fig. 409).

Digestive system (figs 407, 411-421). Mouth deeply situated in median-ventral furTow of snout, bordered by several inner folds. Buccal mass proportionally very large, situated almost entire posterior to snout. About half of buccal mass constituting by greatly developed jaws and

Wyszukiwarka

Podobne podstrony:
157 Vol. 36(2), 2001 rounded and tali, situated between it and style sac aperture, lies within intes
163 Vol. 36(2), 2001 expands as an opened groove. Outer lamina simple, with flap protecting nephrost
167 Vol. 36(2), 2001 3) presence of the nephiostome. On the other hand, what allow a ftinction as an
191 Vol. 36(2), 2001 cavity resemble the adaptation in air-breading prosobranchs as, e.g., Helicina
199 Vol. 36(2), 2001 polarization of pallial oviduct structures i s difficult, as there is no elear
64 origin of the Gandhava conception the Etig-Vedic testimony cannot be considered as conclusive. Th
15 7 Putting provisions of a contract into practice. Actually, this phase may not be considered as a
155 Vol. 36(2), 2001 originating in inner middle region of subradular membranę inserting in m7 and i
159 Vol.36(2), 2001 its pair inserting in radular ribbon intemally io radular sac (fig. 206); 3) som
161 Vol. 36(2), 2001 but some variation occurs in same ribbon; outer marginal tooth similar to inner
165 Vol. 36(2), 2001 or margin of ovopositor. In ovopositor of immature females (figs 247, 252) only
169 Vol. 36(2), 2001 Remarks. The anatomy of T. hookeri differs from thatof T. communis (cf. Randles
171 Vol. 36(2), 2001 alive, MZSP 28698 (Simone col., 27/x/1996). Remarks. Although the specimens fro
173 Vol. 36(2), 2001 Description. Shell (figs 27, 28,48). Smali (up to 10 mm) slender, turriform, up
175 Vol. 36(2), 2001 Digestive system (figs 348-358). Mouth and buccal mass similar to those of B. v
177 Vol. 36(2), 2001 longitudinal, thickly muscular. Buccal mass poste-riorto snout. Jaws (figs 80,3
179 Vol. 36(2), 2001 after free ftom style sac, bears two loops in right side of this, in this regio
183 Vol. 36(2), 2001 Family Vermetidae Genus Serpułorbis Sasso, 1827 (Typc species: V arenaria
149 Vol. 36(2), 2001 70% ethanol, and were extracted from the shells by decalcif^ation in Railliet-H

więcej podobnych podstron