Mr. A. Adams on new Mollusca from China and Japan. 239 



XXVI. — On some new Genera and Species of Mollusca from the 

 North of China and Japan. By Arthur Adams, F.L.S. &c. 



My observation of the marine Mollusca of North China extends 

 over the whole of the Yellow Sea, from the deep bight between 

 the Yang-tsze-Kiang and the Shan-tung Promontoiy on the west, 

 and the coast of Korea on the east. The water of this sea is 

 muddy and of a yellowish colour, especially near the land. It is 

 also shallow, the greatest depth not usually exceeding 36 fathoms. 

 The nature of the bottom is very unfavourable for molluscous 

 and indeed any other kind of life, on account of the enormous 

 quantity of mud which comes down the rivers, and which sub- 

 sides, aud destroys nearly all marine life. In " races " and tide- 

 ways, off points of land, and in the deep sandy bays, many spe- 

 cies of interest may, however, be met with ; but, on the whole, 

 I should say that the mere collector of shells could not proceed 

 to a worse field for his labours than the shores of the Yellow Sea 

 and the Gulfs of Pe-chili and Lian-tung. 



Genus Eulima, Risso. 

 1. Eulima gibbosula, A. Adams. 



E. testa pyraniidali-subulata, alba, semipellucida, apice roseo tincto ; 

 spira lateraliter inclinata ; anfractibus circa 1 1 , plauis, suturia 

 marginatis ; anfractu ultimo magao, gibboso, ad basin rotundato ; 

 apertura subcirculari. 



Hab. Lian-tung (Hulu-Shan Bay) ; 3 fathoms. 



This curiously-shaped little species is something like E. pin- 

 guicula, A. Ad., with a subcircular aperture ; it resembles also in 

 some respects E. clavula, A. Ad., but that species is more pyra- 

 midal and flat at the base. 



2. Eulima subula, A. Adams. 



E. testa subulata, spira subtortuosa, alba, semipellucida, apice roseo 

 tiucto ; anfractibus circa 1 1, planis, ultimo ad peripheriam ro- 

 tundato ; apertura acumiuato-ovata ; labio antice vix everso ; labro 

 in medio producto. 



Hab. Gulf of Pe-chili ; 4 fathoms (mud). 



Genus Leiostraca, H. & A. Adams. 

 1. Leiostraca Ariel, A. Adams. 



L. testa subulata, alba, tenui, pellucida ; anfractibus 6|, planatis, 

 suturis obliquis ; anfractu ultimo maguo, ad peripberiam rotundato, 

 ad basin producto ; apertura acuniinato-ovata. 



Hab. Shan-tung (Kala-hai). 



