^2 -'^rt. 1. — M. Yokoyama 



Smitli (Proc. Zool. Sue. Lond., 1879, p. 208, pi. XX, fig. 42) 

 which, however, has the outer lip tuhercnlated within and the 

 canal broader. 



Fossil occurrence. — Shito, Tega, Otake. Also Tabata and 

 Shinagawa in Musashi. 



Living. — Western Japan. 



72. t^otituibella (Afilia) ntetsnkfttloi, Yokoyama. 

 PL II. Fig-. 23. 



Shell small, shortly fusiform. Whorls about eight with apex 

 pointed, only slightly convex, smooth excepting the uppermost 

 ones which are more or less longitudinally plicate. Sutures deep 

 with the raised margin. Body-whorl about twice as high as spire, 

 suddenly narrowed below into the base. Periphery rounded. 

 Caudal portion of the Imse with several oblique furrows. Aperture 

 rhomboidal with columella-lip bent in the middle. Outer lip thin, 

 smooth within, or as is rarely the case, somewhat thickened and 

 subtuberculate within. Canal short, a little bent. Height 10 

 millim. Diamer 4.5 millim. Several specimens. 



The longitudinal plicae of the upper whorls are more or less 

 distinct, if the specimens are not too much worn. In one young 

 example, they are distinct even on the penultimate whorl. 



Columhulla{Mitrello) aurantiaca Dall (Trj^on, Man. Conch., V, 

 pi. 50, fig. 39) of California is nearly like the present shell in form. 

 But it is devoid of the longitudinal plicae as well as of the caudal 

 furrows. 



Fossil occurrence. — Otake, Tega, Shito. Oji and Dokwanya- 

 ma ill Musashi. 



Living. — Central Japan. 



73. Colattilulla (Mitrella) dunkeri, Tryon. 



PI. II. Pig. 26. 



ColumheUa {Mitrella) dunkeri. Tryon, Man. Conch., Y, p. 129, pi. 49, fig. 15. Yoko- 

 yama, Foss. Miura Penin., p. 59, pi. Ill, fig. 15. 

 Atmjcla mrians. Dunker, Maliik. Bliitt., 1800, p. 231, Moll. Jap., p. G, pi. I, fig. 17. 



