292 



MR GUY C. EOBSON ON MOLLUSCA 



vas deferens is peculiar as regards its proximal end soon after it quits the epiphallus. 

 Here it swells out into an ovoid structure, which is involved in the same connective- 

 tissue sheath as the reniform kalJc-sac. 



The spermatheca is simple and moderately long. Close to where the vas deferens is 

 given off from the conjoined male and female ducts there is a round glandular body, 

 brownish in colour, the precise nature of which is as yet uncertain, 



6. Chbonos sublimis, gen. et sp. n. (PL XXXII. figs. 4 ^-6, 9-12 ; PI. XXXIII. 

 fig. 7 a-c.) 



Twenty-five examples (mostly juvenile) from snow-line on Mt. Carstenz (14,200 ft.). 



Text-figure 5. 



Text-figure 6. 



\-Od 



Text-fig. 5. — Peuis of Antinous antliropophagorum. sg., seminal groove; ps., penis-slieath. 



Text-fig. 6. — Genitalia of Antinous anthropopliagorum. pe., penis ; pm., penis retractor ; hs., kalk-sae ; 



vd., vas deferens ; ag., albumen gland ; od., oviduct ; spih., spermatheca ; v., vagina ; cl., common 



genital aperture. 



Cheonos, gen. n. 



Foot with a dorsal mucous pore provided with a covering tongue and a broad peri- 

 podium surmounted by a single groove ; sole tripartite. Shell-lobes absent. Jaw very 

 simple, but remarkably deep ; radula consisting of a number of rows of numerous 

 sickle-shaped teeth, which are very little modified serially. 



Genitalia with an extensive albumen gland, terminating in numerous digitate pro- 

 cesses, and well-developed epiphallus and club-shaped spermatheca. Shell delicate, 

 somewhat like that of Selicarion, the last whorl increasing rapidly, with a wrinkled 



