740 PROCEEDINGS OF THE ACADEMY OF [Oct., 



Alt. 5.3, diam. 10.8, width of the aperture 4.7, obhque alt. 3.4 mm. 



Hotawa, Taiwan. Types No. 89,879 A. N. S. Phila., from No. 1,405 

 of Mr. Hirase's collection. 



Only two specimens of this delicate little Trochomorpha were taken. 

 It is closely related to T. haenseli S. and B., but is less depressed, the 

 umbilicus smaller, the aperture larger, with basal lip much more deeply 

 arcuate. The width of the aperture is contained in that of the shell 

 2.3 times in T. pelhicida, about 2.7 times in T. haenseli. 

 Trochomorpha oultrata formosana n. subsp. 



Similar to T. cuUrata in general shape and color, but rery distinctly, 

 finely and evenly granulose above and below. Whorls 6^, the first two 

 convex, the rest almost flat above; base excavated below the very 

 acute keel, then quite convex, with a strong angle, almost a keel, around 

 the umbilicvis, which is a trifle wider than in T. cuUrata. Basal lip 

 strongly sinuous, being well retracted midivay between the pcriphercU 

 and basal keels. 



Alt. 7, diam. 19.3 mm.; diam. umbilicus, measured from the keel, 

 8 mm. 



Hotawa, Taiwan. Types No. 89,939 A. N. S. Phila., from No. 1,399 

 of Mr. Hirase's collection. 



Twenty specimens of this fine Trochomorpha were taken. Wliile 

 evidently related to T. cultrata of the Ryukyu Islands, it may eventu- 

 ally be given specific rank. 



Otesia japonica (MUdff.). 



Nanina japonica Mlldff., Journ. Asiat. Soc. Beng., LIV, pt. 2, p. 59, ISSo. 



This species, originally described from Sengoku in Kyushu, and un- 

 known in the Ryukyu chain, was taken by ^Ir. Okura at Kiirun 

 (Keelung), five specimens. 

 Helioarion hiraseanus Pilsbrj-, n. sp. 



Shell imperforate, depressed-globose, thin and fragile, pale amber- 

 colored, transparent. Surface very glossy, smooth and polished. 

 Spire convex, narrow. Whorls 3^, rapidly increasing, the last rounded 

 peripherally and beneath. Aperture oblique, broadl}^ lunate, the per- 

 istome with a narrow reflexed cuticular edge. Columella simple, thin, 

 concave. 



Alt. 6, diam. 9.5 mm. 



Sammaipo, Taiwan. Types No. 90,235 A. N. S. Phila.. from No. 

 1,431 of Mr. Hirase's collection. 



Six specimens of this charming species were taken. No snail of 

 similar r^V/'/zia-like shape is known from Formosa, the Ryukjai Islands 

 or Japan. 



