g4 Art. 6. — M. Yokoyania : 



A single specimen with only seven whorls preserved with 

 diameter 2 millim. The height, if perfect, would be about 8 millim. 



Turbonilla approximate/, Dall and Bartsch (Notes on Jap., 

 Indopac, a. Amer. Pyramidellidae, p. 337, pi. XX, fig. 1) which 

 closely resembles the present species is distinguished by having 

 more ribs (22 on the penultimate whorl). 



Fossil occurrence. — Naganuma Zone (Naganuma). 



90. Turbonilla (Mormula) tokunagai, Yokoyama. 

 Pl. V. Fig. 16. 



Shell small, slender, turriculate. Whorls fifteen, the nuclear 

 Avborls two, of which the first is pushed sidewise, so that it appears 

 to be attached to the lateral surface of the second; post-nuclear 

 whorls flatly convex, longitudinally ribbed. Ribs elevated, with 

 interspaces about double their breadth and very faintly, transver- 

 sely striated, sixteen on the body-whorl of which the last forms a 

 varix on the back of the outer lip. Periphery rounded. Base 

 Avithout ribs, but provided with a few fine spiral lines. Aperture 

 subquadrate, with the posterior angle acute. Inner lip reflected 

 somewhat outward. Height 8 millim., diameter 1,7 millim. 

 A single specimen. 



This shell is somewhat like Turbonilla aullca Dall and 

 Bartsch (Notes on Jap., Indopac, and Amer. Pyramidellidae, p. 

 345, pl. XXII, fig. 7) from Kyushu, but in the latter the ribs are 

 more numerous and the intercostal spiral striae stronger and more 

 distinct. 



Fossil occurrence. — Yokosuka Zone (Otsu). 



Family Turbinidae. 



Genus ÎTiir^o, Li\nÉ. 



91. Turbo (Maimorostoma) coreensis, Eecluz. 

 Pl. V. Figs. 19, 20. 



Turbo corcensis. Eecluz, Journ. de conch., 1S53, p. 245, pl. 8, fig. 2. Pilsbkt, Cat Mar. 

 Moll. Japan, p. 89. 



Turbo coron ius var. coreeusis. Tkton, Man. Cone)-'., X, p. 217, pl. 47, fig. 19. 

 Lunclla granulata var. corcensis. Dunkke, lud. Moll. Mar. Jap., p. 128. 



