388 THE LAND MOLLUSCAN FAUNA OF BRITISH NEW GUINEA, 



plates. On the laterals develop a minor proximal cusp, and the 

 larger cusp becomes rounded. 



On specimens from Rossel Island, Louisiades, were made the 

 following notes. 



Papuina chapmani, Cox. 



Genital system provided with a flagellum two-thirds the length 

 of the epiphallus ; penis sac stout ; right tentacle retracted 

 between male and female branches (PI. xxvi., fig. 29). 



The jaw (PI. xxv., fig. 11) is arched, ends rounded, crossed by 

 weak ribs. 



Radula (PL xxv., fig. 12), formula 138 rows of 32 : 6 : 1 : 6 : 

 32, of the same pattern as the preceding. 



Papuina gurgusti. Cox. 



Genital system : epiphallus long with rudimentary flagellum ; 

 papilla long and tapering (Ph xxvi., fig. 26). 



Jaw (PI. xxv., fig. 19) like the foregoing. Radula (PI. xxv,, 

 fig. 18), formula 145 rows of 47 : 10 : 1 : 10 : 47, of similar 

 character to the last. 



Trochomorpha nigrans, Smith. 



Genital system : penis sac surmounted by a globose bilobed 

 pouch, half its size, from the base of which arises the epiphallus. 

 The boot-shaped spermatheca is seated upon a short duct. The 

 above note was made before I saw the account of T. planorhis 

 in Pilsbry's review of Trocliomovpha [Man. Conch. (2) ix.], and T 

 am not now able to say whether the external resemblance of P. 

 nigrans to it is completed by the possession of internal vaginal 

 glands. 



Radula (PI. xxvi., fig. 28) small, narrow, formula 118 rows of 

 26 : 23 : 1 : 23 : 26. Rachidian slender, with a single lanciform 

 cusp which projects beyond the basal plate. Laterals slightly 

 larger and inclined. Marginals sinuate, bicapitate. 



