712 PROCEEDINGS OF THE ACADEMY OF [Oct., 



M. hahajimana jejuna n. subsp. 



Smaller than hahajimana and typically with the spire distinctly 

 lower, though still quite convex. There is a fraction of a whorl less. 



Alt. 2.8, diam. 5 mm. 



Imotojima. Types No. 84,955, A. N. S. Phila., from No. 803e of Mr. 

 Hirase's collection. 



Similar specimens, but with the spire a little higher, more like typical 

 M. hahajimana, were taken on Nakanoshima (S03c of Mr. Hirase's 

 collection), the largest measuring alt. 3.3, diam. 5.2 mm. The spire 

 is about as high as in typical hahajimana. Others came from Anijima 

 (No. 803a of Mr. Hirase's collection), 3x5 mm.; and another lot, of 

 the same size, from Anejima (803d). 



M. hahajimana kitaiwojimana n. subsp. 



Smaller than any of the preceding, wdth the spire elevated as in 

 typical M. hahajimana. Aperture more narrowly crescentic. Whorls 



^. 



Alt. 2.7, diam. 4 mm. 



Kita-iwo-jima, Ogasawara. Types No. 89,867, A. N. S. Phila., 

 from No. 803/ of Mr. Hirase's collection. 



M. hahajimana pachychilus n. subsp. 



Similar to typical M. h. jejuna in shape, the spire being more de- 

 pressed than in M. hahajimana; outer and basal margins of the peris- 

 tome distinctly thickened ivithin. Whorls 4^. 



Alt. 2.8, diam. 5 mm. 



Mukojima, an islet near Hahajima. Types No. 84,949, A. N. S. 

 Phila., from No. 8036 of Mr. Hirase's collection. 



Miorooystina anijimana n. sp. 



Shell minutely perforate, depressed, convex above and below, thin 

 pale brown, somewhat transparent. Surface smooth, with no trace 

 of spiral striae. Whorls nearly 4J, but slightly convex, the suture 

 linear, with a narrow transparent margin below; last whorl rather 

 acutely angular in front of the aperture, elsewhere rounded. Base con- 

 vex, impressed around the perforation. Aperture slightly oblique, 

 crescentic, the outer and basal margins thin, columellar margin slightly 

 thickened within, with a very weak, low median nodule. 



Alt. 2.2, diam. 4 mm. 



Anijima, Ogasawara. Types No. 83,298, A. N. S. Phila., from No. 

 803a of Mr. Hirase's collection. 



Readily distinguished from the smaller forms of M. h. jejuna by the 

 angulation of the periphery in front. A single specimen of apparently 



