1908.] NATURAL SCIENCES OF PHILADELPHIA. 579 



very deeply immersed. Principal plica very short, weak and lateral. 

 Lunella low above, becoming very strong toward its lower end, which 

 is thickened and curves inward (fig. 10). There is a short, tubercular 

 fulcrum, but no sutural plicse. 



Length 9.8, diam. 2 mm. 



The clausilium is broad above, tapering to the apex, which projects 

 somewhat. It is strongly curved throughout, V-shaped in section 

 near the apical end, dilated on the palatal side near both ends, and 

 deeply excised on the columellar side of the filament, as usual. 



Sumiyoho, Oshima, Osumi. Types No. 95690 A. N. S. P., from No. 

 1504 of Mr. Hirase's collection. 



This very distinct little species is more slender than C. entospira 

 or C. exulans, and differs from all known Japanese species by having 

 a conical tooth at the upper third of the outer lip, forming, with the 

 superior lamella, an oval sinulus. 



Section PARAZAPTYX Pils. 

 Clausilia thaumatopoma Pils. 



Originally described from Kumejima, this species has also been found 

 on the island of Kerama (Keramajima). in several places — ^Tokashiki, 

 Zamami and Tokashikijima. Most of the specimens from this island 

 are more slender than the types, with more whorls; yet some agree 

 with typical thaumatopoma in these respects, so that a subspecific 

 separation seems impracticable. 



The measurements of several specimens follow: 



Length 11.0, diam. 2.4 mm.; whorls 9 )„ 



^ ' " »i j Kumejmia. 



" 10 ] Tokshiki, 

 " 7f I Keramajima. 



^, ' ) Zamami, 

 ,, ^ ( Keramajima. 



" 9^ I Tokashikijima, 

 " 8i i Keramajima. 



The sculpture and the internal structure seem to be practically the 

 same throughout the series of 23 examples examined. 



Section METAZAPTYX Pilsbry. 

 The shell is similar to Zaptyx in having sutural plicse, fulcum and 

 parallel lamella. The inferior lamella is very broad loithin, ascends 



