352 PKOCEEDINGS OF THE ACADEMY OF [June, 



being but slightly developed. Columellar tooth strong, as usual. 

 Palatal fold wanting. 



Length 3, diam. 1.4 mm. 



Oshima (Mr. Y. Hirase, No. 651). 



This species has a longer, more attenuated spire than D. 

 luchuana, and it differs from that and all other described Japanese 

 species in the widely spaced riblets of the spire. Moreover, no 

 palatal fold is seen through the front of the whorl, and upon open- 

 ing a specimen I found it wanting. 



Diplommatina luchuana n. sp. 



Shell small, dextral, oblong-conic, brown, finely striate, the strife 

 much less strong than in other described species of Japan or the 

 Loo Choo Islands. Whorls 6, convex, the penultimate and last 

 of about equal diameter, those above regularly tapering, forming 

 a long, conic spire. Last whorl ascending to the aperture, con- 

 stricted at its beginning in front. Aperture somewhat longer than 

 wide, the left margin straightened ; peristome continuous, the outer 

 lip reflexed, duplicate by a narrow crest close behind it; columellar 

 tooth strong; palatal fold very short. Length 2.3, diam. 

 1.15 mm. 



Province of Kunchan, Okinawa (Loo Choo) Island (Mr. Y. 

 Hirase, No. 629). 



Decidedly conic above, as in the larger D. Kobelti Ehrm. The 

 striatiou is weaker than in other Japanese species of the group, 

 none of which, except D. Kobelti, have so tapering a spire. The 

 palatal fold is shorter than in the other species of the region. The 

 surface seems to have no sj^iral stri:^ between the longitudinal strioe. 

 Diplommatina septentrionalis n. sp. 



Shell dextral, corneous or pale brown, cylindric-oblong, finely 

 rib-striate, about 12 striie in the space of a millimeter on the penul- 

 timate whorl, the stripe more Avidely spaced on the last whorl ; 

 under a high magnification showing excessively minute, close, 

 creoulated spiral striae between the rib-strise. Whorls nearly 6^, 

 convex, the first three forming a short terminal cone, the others 

 wide, last whorl ascending to the aperture. Aperture subcircular, 

 the lip continuous, reflexed, duplicate by a narrow crest close behind 

 it; columellar tooth moderately sti'ong; palatal fold rather long. 

 Length 2.9, diam. 1.5G mm. 



