-~1 
TESTACELLA HALIOTIDEA. 
INTERNALLY, the REPRODUCTIVE ORGANS are more 
complex than in the allied species, the PENIS-SHEATH 
being terminated distally by a eaecal enlargement and 
an abrupt flexure, although Lacaze-Duthiers and others 
figure the male organs, of what they affirm to be this 
species, without these adjuncts ; beyond the penis is the 
EPIPHALLUS and a well developed and somewhat cla- 
vate FLAGELLUM, which Lacaze-Duthiers affirms is 
evaginated during pairing ; and which is furnished with 
a slender lateral and a powerful distal retractor, the 
latter affixed at the caudal extremity of the body ; the 
VAGINA and ATRIUM are usually rather short; the 
large oval SPERMATHECA is attached to the oviduct 
near the base of the albumen gland, and has a short, 
thick and fusiform duct ; OVOTESTIS composed of small, 
loose, oblong follicles with a tortuous duct. 
The ALIMENTARY CANAL has the simple doubly- Fe eats) : 
flexed course characteristic of the genus Testucella. peste cide hoa 
The (2SOPHAGUS is extremely short, the CROP whitish, (Horsham, Mr. T. Whitaker). 
longitudinally and transversely wrinkled, and about 8 alb.g. albumen gland ; ef. ept- 
mill. long, beyond which the canal is constricted ; at the — Phallus; 7. fe agellom ae 
5 i testis; ov. oviduct; /.s. peuis 
first bend of the gut, the vestigial STOMACH shows asa _ sheath; 77. retractor muscle : 
purplish enlargement, and receives the bile ducts from — sf. spermatheca; sf.d¢. sperm 
the ample light-brown liver; a short distance beyond the — ucts 7-4. vas deferens. 
canal gradually n narrows and runs backward as the rectum to the anus. 
The RETRACTORS of the right and left tentacles are separate, quite independent 
of each other, and almost symmetrically fixed near their respective foot-margins. 
The LINGUAL SHEATH is very long, somewhat 
compressed, tapering obliquely behind, and reaching 
back nearly to the hinder extremity of the body, 
RETRACTORS consisting of three or four partially 
fused terminal muscles, secured to the skin of the 
left side beneath the shell, and in addition ten to 
fifteen pairs of oblique ribbon-like lateral muscles, 
arising from the left side of the hinder halt of the Fic. .0)—einguall sheath’ oe 
sheath, the most anterior being about six mill. long — 7estacedla haliotidea, Bristol, col- 
and attached to the skin on the left side of the mid- lected by Mr. J. W. Cundall, illus- 
dorsal line, while the shorter and more posteriorly- 9 "ts the retractor muscles of the 
2 5 , tentacles and lingual sheath. 
placed muscles are fixed nearer and nearer to the 
sole, to which the last few muscle-bands are fixed, close by the straight terminal ones. 
The LINGUAL TEETH are stout, arcuate, and distinctly barbed, with the convex 
apical surface furnished with a somewhat distinct cutting blade, the median 
iy 
iD Fic. 11.—Isolated teeth from 
Fic. 10.—Transverse row of teeth from the odontophore of the fifth and thirteenth longitu- 
Testacella haliotidea * 20, from Oxford, collected by Professor dinal rows of the radula of 7. 
Poulton, photographed by Mr. T. W. Thornton. haliotidea x 40. 
apophysis large and distinct, basal enlargement slight, and the transverse rows more 
acutely angulated! than in the allied species. According to Lacaze-Duthiers, the 
vestigial median teeth are discernible with a magnifying power of 200-300 diameters. 
The dental formula? of an Oxford ex ae is 
EaPO eee OEls =. 
i ORO 0 381368 
1 The figure of the dentition given in Woodward's Manual, p. 298, and copied therefrom as that of 
Beieeaia haliotidea by many authors, is not really that species, but should be assigned to 7. maugez. 
2 Monog. i., p. 262. 
