Fossils ir,.m the M iura Peninsula and its Immediate;North. 51 



the other four are convex and spirally threaded, with threads 

 unequal, several smaller (unequal) threads being found letween 

 the larger and more distant ones. 



Growth-lines coarse. Aperture subrhombic, with a short 

 recurved canal. 



The whorls show some variation in form. When the larger 

 spiral threads are very coarse, the whorls, especially the body- 

 whorl, are sub-angulated at the periphery (fig. 10.); when they are 

 not specially coarse, then the whorls are more rounded (fig. 9). 

 Fig. 8 shows a form intermediate between the two« 



Rather frequent. 



Fossil occurrence. — Kanazawa Zone (Nojima); Koshiba Zone 

 ( Koshiba); Naganuma Zone (Iijima and Kikkösan). 



Living.— British Columbia (50° 49' N. Lat,), at* 238 fathoms 

 with water-temperature 7°C. A specimen is in my possession from 

 an unknown locality in Japan, measuring 53 millim. in height. 



38. Ckrysodomus schrencki, Yokoyama. 

 Pl. III. Fig. 1. 



The specimens are frequent, but invariably more or less 

 fractured, so that a full description of the shell must be postponed 

 to the future. 



In general, however, the shell is moderate-sized, rather thin 

 and turrete-fusiform in shape. The whorls which may number 

 about ten are convex and separated from each other by a narrow, 

 but distinct, shallow, horizontal canal, bordered exteriorly by a 

 low ridge. Body-whorl long, about as long as the ^spire. The 

 sculpture consists of regular, subequidistant, spiral, impressed 

 lines which number about twelve on the penultimate whorl. 

 Aperture oval, passing below into a short, rather bent canal. 

 Growth-lines coarse. The figured specimen measures about 35 

 millim. in diameter. Its height, if perfect, would be about 100 

 millim. 



This species is closely akin to Ckrysodomus pericocldiun 

 Schkenck (Moll. nord, japan. Meeres, p. 433, pl. XVII, figs. 11, 

 12) of Northern Japan. But the latter has flatter whorls, narrower 



