' Fossils froui the Upper Musashino of Kaznsa and Shimosfi. JQl 



145. Tnt'honilla {€J1i€ènnit^iu) ituhana, Yokoyaina. 

 PI. IV. Fig. 35. 



Shell small, elongate-conic, gradually tapering poste^iorl^^ 

 Nuclear whorls helicoid, standing on edge at the summit. Post- 

 nuclear whorls about nine, somewhat convex, separated by deep 

 sutures, longitudinally plicate. Plica? tAventy on the penultimate 

 whorls, very obtuse, shghtly curved, oblique, the lower end being 

 more anterior than the upper. Interspaces between plicfe very 

 narrow, much narrower than plicae themselves which are free at 

 both ends. Periphery somewhat angulate. Base abruptly 

 narrowed, with only faint indications of plicee. Aperture sub- 

 quadrate, obtuse behind. Height 5 millim. Diameter 1.5 millim. 

 Rare. 



This is somewhat like TurboniUa dimherl Clessin (Dall and 

 Bartsch, Pyramidehidœ loc. cit., p. 336, pi. XX, fig. 3) in which, 

 how^ever, the interspaces between the plicœ are wider and the 

 plicse fuse with one another at the periphery. 



Fossil occurrence. — Shisui (rare), Tega (do), Shito (do). 

 Oji in Musashi. 



Living. — Central Japan. 



146. Tuè'honilla (Mortnula) p€tucieosfulafn, Tokunaga. 

 PI. IV. Fig. 37. 

 Tuybunilla jjaucicodulfita. Tokuuaga, Foss. Env. Tokyo, p. 22. 



Tokunaga in tlie above work gives neither the description nor 

 the figure of this species, but simply says that it is like TurboniUa 

 tlegantlssima Mont., the only difference being in the number of 

 whorls and ribs. The following description is based on the speci- 

 mens left by him in the museum of the the Imperial University 

 of Tokyo. 



Shell medium-sized, elongate-conic. Nuclear whorls helicoid, 

 standing on edge at the summit. Post-nuclear whorls eleven 

 or twelve, flatly convex, longitudinally costellate and finely 

 spirally striate. Coste'll^e rounded, about twenty on the penultimate 



