12 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



1 91 5. Blanfordia beiisoni Pilsbry, Nautilus, vol. 29, p. 2, fig. 4. 



1924. Pomatiopsis hirasci Pilsbry, Proc. Acad. Nat. Sci. Philadelphia, vol. 76, 



p. 12. 

 1924. Pomatiopsis bciisoiii Pii.sbry, Pruc. .Acad. Nat. Sci. Philadelphia, vol. 76, 



P- 13- 

 1924. Blanfordia bciisoni A\,\axdale, .Ainer. Journ. Hyg., Mon. Ser. no. 3, 



pp. 288-291, fig. 13. 

 1924. Blanfordia bensoni hirasci Axnaxdale, Amer. Journ. Hyg.. Mon. Ser. 



no. 3, pp. 291-293, text fig. 6B. 

 1929. Blanfordia (Vicina) beiuoni Thiele, Handb. Syst. Weicht., pt. i, p. 150. 

 1934. Blanfordia bensoni Pilsbry, Journ. Parasit., vol. 20, pp. 281-283. 

 1934. Blanfordia hirasci Pilsbry, Journ. Parasit., vol. 20, p. 283. 

 1934. Tomichia bensoni Bequaert, Journ. Parasit., vol. 20, p. 281. 



Shell large, elongate-ovate, moderately thick, light horn-colored 

 with the outer edge of the peristomes chestnut l)rown. Interior of 

 aperture a little lighter than the outside. The nuclear whorls in all 

 of our specimens are decollated. The postnuclear whorls are inflated 

 and strongly rounded and marked 1)y moderately strong incremental 

 lines which at irregular intervals develop into axial threads, probably 

 marking resting stages in the growth. In addition to this, the whorls 

 are marked by microscopic incised spiral lines and distantly placed, 

 poorly and irregularly developed spiral lirations. All these sculptural 

 elements are less strongly developed in the early postnuclear turns 

 and gain slightly in strength as the shell increases in size. Suture 

 strongly impressed ; periphery and base inflated and strongly rounded, 

 and marked with the same sculpture that characterizes the spire. The 

 base is narrowly umbilicated. Aperture very broadly irregvilarly 

 ovate; peristome slightly expanded and appressed and adnate to the 

 preceding turn on the parietal wall. The oi^erculum has 2.2 whorls. 

 The radula is large and the rachidian tooth has a strong median cusp 

 with 2 lesser cusps on each side and 4 basals on each side that de- 

 crease in size from the inner outward, the formula therefore being 



2-1-2 



~ . The lateral tooth is very oblique and has a powerful cusp 



4-4 

 with 2 lesser cusps on the inside of this and 3 on the outside. The 



first marginal bears 7 denticulations, and the outer marginal has 5. 



The United States National Museum has three lots of this species, 

 all collected by Y. Hirase in the southern end of the island of Hok- 

 kaido, as follows : 



U.S.N.M. no. 307812, seven specimens from Ojima. Of one of 

 these, we have given the figure of the shell, radula. and operculum. 



A second lot, U.S.N.M. no. 162602, six specimens from Shikunobe. 

 Ojima. 



