1855.] Chusan Shells. 123 



a silky lustre to the epidermis. The base of the shell has an oblique 

 keel at the back of the canal on the peristome, as in Goniostoma, 

 Swainson (Bulimics goniostoma, Sowerby. Zool. Journ. Vol. I) Swain- 

 son has placed Clausilia among the Achatinidce, and the discovery 

 of this interesting species will go far to prove the propriety of 

 the location. This shell represents the subgenus Goniostoma in the 

 neighbouring group of Bulimus. Among the Achatina proper, it 

 would seem to represent Achatinella, in which the emargination at 

 the base of the inner lip is fortified by a thickening of the base of 

 the columella. 



This Clausilia was only observed after heavy and protracted falls 

 of rain, when Dr. Cantor found at different times three specimens 

 lying on the ground. Eight other specimens were found by digging 

 in the wet earth, where they appeared in company with the smaller 

 Clausilia aculeus. The animal is like that of C. aculus, and differs 

 only in size, and in being of a greyish black colour. 



Clausilia acultjs, Benson. 



Testa subulata nitida, epidermide fuscescenti, anfractibus 10 aut 

 11, oblique leviter striatis ; apertura dentibus duobus vel tribus 

 munita, peristomate reflexo. 



Axis longioris 65, minoris 0.5 poll. 



There are two sizes of this shell ; the dwarf kind appears to be 

 the more abundant. It varies in the presence or absence of the 

 lower plait or tooth, as do some of the European species. Neither 

 of the larger specimens, which I have under inspection shews any 

 trace of it, while in the dwarf variety it is more frequently exhibited 

 than otherwise. The specimens appear to be by no means liable to 

 truncation. 



" Lives in the earth, on mossy stones, walls and trees. Appears 

 in great numbers in rainy weather. The Chinese call this species 

 by the same name as C. pluviatilis." 



Achatina eeecta, Benson. 



Testa albida, solidiuscula, subulato-turrita, epidermide foeda, sea- 

 bra, anfractibus octo planulatis, suturis impressis, apice obtuso. 



This shell beloogs to the same division as, and is closely allied to, 

 our Indian Bulimus gracilis, Tlutton, and Bulimus clavulus of the 



