216 HUGH WATSOX. 



moderate thickness, convex, laterally compressed, Avitli a 

 prominent conical apex projecting beyond the posterior 

 margin; sinus of moderate depth. 



Pedal gland (lig. 57). — Much smaller than in the last 

 species, curving alternately to the right and to the left in a 

 comparatively regular manner ; glandular tissue extending 

 throughout its entire length. 



Nervous system (PI. XY, figs. 72, 74, 76).— With buccal 

 ganglia situated anteriorly; connectives short; nerves to pedal 

 gland rather slender. 



Digestive System (PI. XVI, fig. 87; PI. XVII, figs. 

 110-114; Text-fig. 4, E, F, p. 161; PL XXI, fig. 134, PI. XXII, 

 fig. 135). — Radula 4 or 5 mm. long ; central tooth present, 

 with a very short, broad, single cusp ; eight or nine laterals 

 with short double cusps, and more than twice as many 

 marginals with longer narrower cusps, on each side, the 

 transition between laterals and marginals being rather abrupt; 

 formula (of a Port Shepstone specimen) : (23 + 9 + 1 + 9 + 

 23) X 63. Odontophore small, with a single slender buccal 

 retractor. CEsophagus narrow, shorter than the salivary 

 ducts ; crop swollen between the salivary glands ; intestine 

 narrow, fii'st loop deep, posterior continuation on right side of 

 liver. Salivary glands separate. Liver of two approximately 

 equal divisions, the intestine only traversing the right. 



Vascular System (PI. IX, fig. 31). — Pulmonar}^ veins 

 forming a network. " Posterior aorta " supplying left division 

 of liver and hermaphrodite gland; right division supplied by 

 two arteries from the anterior aorta which arise at some 

 distance from each other ; anterior aorta passing through loop 

 of intestine. 



Reproductive System (PI. XXIII, fig. 149). — Her- 

 maphrodite gland consisting of a cluster of small follicles ; 

 hermaphrodite duct only very slightly convoluted; common 

 duct very long and much convoluted and twisted; vagina 

 i-ather broad; receptaculum seminis rather small; receptacular 

 duct fusiform, swollen towards the anterior end. Penis long 

 and narrow excepting at the posterior end, where it is 



I 



