Fossils from the Mhtra Peninsula and its Immédiate North. Q\ 



anterior which is weak. Height ß millim. Diameter 2,8 millim. 

 A single specimen. 



This shell is closely akin to our living species Pyvamidella 

 pulchella Adams (Dall and Bartsch, Notes on Jap., Indopac, a. 

 Amer. Pyramidellidae, Proc. U. S. Nat. Mus., XX, p. 323, pi. 

 XXV, fig. 4.), but it is shorter with the whorls a little more 

 convex and sutures deeper. 



Fossil occurrence. — Naganuma Zone (Naganuma). 



There is a specimen of a Pyramidella from Yokosuka 7 millim. 

 high and 3 millim. in diameter exactly like that from Naganuma 

 both in shape and coloring, but distinguished by the somewhat 

 thickened outer lip with three transverse teeth within, of which 

 the lowest is comparatively very small. At first I took it for a 

 different species, but as there is a possibility of its being an 

 abnormal or pathological form, I prefer to treat it for the present 

 simply as a variety under the name of var. dentata. 



Genus OtfoHfomia. Fleming. 



85. Odostomia (Odostomia) hilgendorffi, Clessin. 



Pl. V. Fig. 9. 



Odostomia hilgendorffi. Clessin in Conch. Cab. Mart. u. Chemn., 2d ed., Pyramidella, 

 1900, p. 119, pl. XXVIII. fig. 5. Dall a. Bartsch Notes on Jap., Indopac, a. Amer. 

 Pyrarnidellidœ, Proc. U. S. Nat. Mus., p. 364. pl. XXIV, fig. 5. 



This species has been minutely described by Dall and 

 Bartsch in the above mentioned work, but the specimen on which 

 the description was based having had the outer lip fractured, no 

 mention is made of several transverse ridges which line the inner 

 surface of the outer lip at a little distance from the margin. 

 The largest of the fossil specimens which measures about 7 millim. 

 in height shows them very distinctly, while in the smaller ones 

 they are more or less weak. (On the plate, the species has 

 been numbered by mistake as 0, below fig. 8). 



Fossil occurrence. — Naganuma Zone (Naganuma). 



Living. — Northern Japan (Hakodate). 



