300 ME. GUY C. EOBSON ON MOLLUSCA 



The radula (PI. XXXIII. fig. 4). — Unfortunately the marginal teeth were destroyed 

 in extracting the lingual ribbon, so that the description labours under a regrettable 

 deficiency. The median and lateral teeth would appear to be of the same type as 

 those of P. kubaryi. Upon the internal edge of the cusp of the tenth (or ninth) lateral 

 a small projection appears, which persists to the end of the series available for study. 

 A similar cusp appears in the case of P. Jcuharyi in about the same position. 



The salivary gland corresponds pretty closely to the description given by Kiikenthal 

 for P. vitrea, viz. : "Ein flache . . . ziemlich kompakte belag." But it is characterized 

 by ending anteriorly in a sharp point, which is continued past the origin of the two 

 slender salivary ducts. 



The nervous system may be most conveniently studied by referring to the figure 

 (PI. XXXIII. fig. 1). 



The ge7iitalia (text-fig. 11, p. 299). — The upper end of the penis-sac is squarely 

 truncate, and is continued as a well-developed epiphallus, to which, at about half 

 its length, the retractor is attached. There is a somewhat pointed and moderately 

 long Jlagell'um. 



The spermatheca is long, and gradually expands up to its rounded and flattened 

 distal extremity. There is a large vaginal dilatation of doubtful nature situated just 

 before the origin of the spermatheca. 



Only portions of the hermaphrodite duct and albumen gland were available for 

 figuring. 



9. Papuina taumantias (Tapparone Canefri). 

 Helix taumantias T. Canefri ( lo). 



One shell (locality unknown). 



10. Cristigibba tortilabia (Lesson). 



Helix tortilabia Lesson, Voy. de la ' Coquille/ Zool. ii. p. 311. 

 One shell from Launch Camp. 



11. Cristigibba sp. 



One shell from between Base and Cano Camps. 



This specimen, which appears to be near but not the same as C. tortilabia, is too 

 immature to justify description. 



12. Sulcobasis sp. 



Two shells from between Camps 11 and 12 (8000-11,500 ft.). 



These specimens are too badly damaged to describe as representing a new species, 

 although they would appear to be different from the known species of this genus. 



