1905.] NATURAL SCIENCES OF PHILADELPHIA. 707 



Nogawa, Tosa. Types No. 89,962, A. N. S. Phila., from No. 1,026& 

 of Mr. Hirase's collection. 



The special features of this form may entitle it to specific rank, but 

 for the present its relationship to D. tosana may be kept in view by 

 the use of a trinomial designation. 



Falaina (Adelopoma) paucioostata n. sp. 



Shell sinistral, perforate, cylindric-conic, white or pale yellow, thin, 

 sculptured with delicate widely spaced thread-like riblets, about 20 

 on the last whorl. Wliorls 5^, very convex, the earlier ones rapidly 

 increasing, the last two about equal. Last whorl well rounded periph- 

 erally and basally, having a weak, inconspicuous constriction above the 

 columella. Aperture nearly circular with continuous peristome, not 

 dilated on the parietal wall. Peristome reflexed, with an inner rim; 

 columellar tooth small and deeply situated. 



Length 2.2, diam. LI mm. 



Nanae, Ojima, Yesso. Types No. 89,813, A. N. S. Phila., from No. 

 1,311, of Mr. Hirase's collection. 



This species is larger than P. pusilla {Diplommatina pusilla Martens) 

 or its variety omiensis Pils., with much more widely-spaced riblets. 



TRUNOATELLID^. 

 Trunoatella japonica n. sp. 



Shell of the usual cylindric, truncate shape, 3^ whorls remaining; of 

 a light reddish color. Sculpture of nearly straight rounded ribs about 

 as wide as their intervals, 28 or 30 on the last whorl. There is usually 

 a small crest behind the lip, which is narrowly expanded. Aperture 

 ovate. 



Length 5.8., diam. 2.3 mm. 



Length 5.6, diam. 2.1 mm. 



Futami, Ise. Types No. 89,942, A. N. S. Phila., from No. 1,319 of 

 Mr. Hirase's collection. 



This species is related to T. kiusiuensis, from which it differs in the 

 smaller size, smaller and more numerous ribs, there being about 30 on 

 the last whorl, while T. kiusiuensis has about 20; and the rib behind 

 the lip is not so large. T. pfeifferi Marts., described from Japan- with- 

 out more exact locality, is larger and more robust, 6x3 mm,, and is 

 sculptured "with nearly straight riblets equal to their intervals, and 

 evanescent on the last whorl." It has not been figured, and was col- 

 lected by Siebold, Mr. Hirase has found no Truncatella agreeing 

 with the characters quoted. The province Ise is on tlie East coast of 

 the main island. The locality is far north for a Truncatella. 



