Fossils from the Upper Musashino of Kazusa and Shimosa. 41 



Frequent. The largest specimen measures 1<S millim. in 

 lieiglit and 4.8 millim. in diameter. 



Besides the typical form just described, there is a shorter one 

 (tig. o2) with a less number of whorls and the canal usually some- 

 what wider. I consider this merely as a variety, for which I 

 propose tlie name of hrevis. 



Fossil occurrence. — Shito. 



Geiuis .^lAXftlLIA, Risso. 



l\r?. lEanffitifi f/esliai/esii, Duiiker. 



Minnjilia deshat/i'sii. Duiiker, Moll. Japon., p 3, pi. I, tig. 3. Pilsbry, Catalogue, p. 



19. Tryou, Man. Conc-h., VI, p. 256, pi. XXII, fig. 71. 

 Pleurotoma {MangUia) deshayesii. Yokoyama, Foss. Minra Penin., p. 41, pi. I, fig. 24. 



A few specimens. Tlie description of the shell is given in my 

 work above referred to. 



Fossil occurrence. — Otake and Tega. Oji (frequent). L(»wer 

 Musashino of Koshiba. 



Living. — Central r\n(\ ^^'estern Ja}>an. 



itii. [Mail fji/ if t t>Jieitsis, (Tokniiaga). 

 P]. I. Fig-. 33. 

 Pleiirotç)ua ojiensis. Tokunaga, Foss. Env. Tokyo, p. 15, pi. I, fig. 28. 



Shell small, rather solid. Whorls seven of wdiich five are 

 post-nuclear, convex, somewhat angulate a little above the middle, 

 with the surface above the angle steeply sloping. The sculpture 

 consists of longitudinal rihs and spiral striae. The rihs are alîout 

 fifteen on the penultimate whorl, perpendicular to the suture above 

 the angle, somewhat oblique below with the upper end directed 

 somewhat forward, obtuse, much narrowei" than the interspaces. 

 Spiral striae fine, numerous, more or less unequal, often indistinct. 

 On the body-whorl the longitudinal ril)s vanish toward the base. 

 while the spiral striae are quite distinct. Periphery rounded. 

 Aperture fusiform, pointed behind, truncate "in front, with a very 

 short straight canal. Outer lip varicose without. Sinus very 



