Qg Art. 1. — M. Yokoyouia : 



threads and plicae are always more or less tuberculous. The bod}^- 

 whorl has the peripher}^ rounded, and the base quickly narrowed 

 and covered with several spiral tubercular threads down to near the 

 caudal end wdiere there is a sharp spiral ridge bounded behind by 

 a broad groove. Aperture elongated, angulate behind and widened 

 in front. Canal very short, recurved. The largest of the three 

 specimens obtained measures P)2.5millim. in height and 13.5 mil- 

 lim. in diameter. 



This species is still living, the specimens obtained near 

 Kamakura attaining a somewhat larger size than the fossil. 

 Contrary to the great inconstancy of the surface-sculpture, the 

 shape seems to be tolerabl}^ fixed. The colour is dusky brown. 



Fossil occurrence. — Kioroshi, Shito. 



Living. — Central Japan. 



Genus PARVITEKEBKA, Pilsbry. 



28. Par vit er ehr ft rarifans, Yokoyama. 

 PI. I. Fig. 25. 



Shell small, solid, lanceolate. Whorls about seven, the first 

 two smooth and rounded, the remaining very little convex and 

 longitudinally weakly plicate. Plicae nearly straight, numerous 

 about twenty on tlie penultimate whorl, indistinct or obsolete on 

 the body-whorl. Tliere are also impressed spiral lines numbering 

 a little over ten on the penultimate whorl. Body-whorl very large 

 higlier than the spire and with the spiral lines down to the caudal 

 end. Aperture elongated, acummate behind and truncate in 

 front. *' Inner lip covered with a callus. Outer lip rather sharp. 

 Height 8 millim. Diameter 2.2 millim. Height of body-whorl 

 4 millim. Length of aperture 2. o millim. 



Parviterebi^a paucivolvls Fihhry {Nk^\y J-àY). Mar. Moll., Gastr. , 

 Proc. Acad. Nat. Sei. Philad., Jan., 1904, p. 5, pi. I, fig. 4) from 

 Southern Kyushu is somewhat like the present species. But in 

 the former the shell as well as the aperture is longer and the callus 

 of the inner lip absent. 



Fossil occurrence. — Otake (rare). 



