Molluscafrom the Seas of China and Japan. 309 



with regard to the position of the cartilage. I believe the place 

 of the genus to be in Lasaida. 



Thecodonta Sieboldi, A. Ad. 



T. testa oblonga, obliqua, valde inaequilaterali, convexiuscula, sub- 

 incrassata, alba, concentrice sulcata, sulcis subdistautibus ; umbo- 

 nibus parvis, latere antico breviore rotuadato, postico lougiore 

 rotundato ; margine ventrali simplici. 



Alt. 1| lin., lat. 2^ liu. 



Hab. Gotto Islands ; 71 fathoms. 



Two left valves only were obtained, one of them in very good 



condition. The pallial line is thickened and impressed with 



radiating grooves, and the anterior muscular scar is very strongly 



marked. 



Bucardia {Meiocardia) Cumingi, A. Ad. 



B. testa transversa cordata, obliqua, cereo-alba, immaculata, concen- 

 trice plicata, plicis validis, regularibus, sequaUbus, angulatis, super 

 carinam terminantibus ; latere antico brevissimo ; umbonibus par- 

 vis ; latere postico subacurainato, elongate, carinato ; area postica 

 tenuiter striata. 

 Hab. China Seas. 



In form this species very much resembles Isocardia Lamarckii, 

 Reeve ; but the whorls are of a pure waxy white, the concentric 

 plicae are more conspicuous and angular, and the beaks are 

 smaller, closer together, and not quite so much intorted. 



Eucharis Recluzi, A. Ad. 



E. testa subquadrato-elliptica, subcompressa, alba ; umbonibus par- 

 vis, antrorsum vix inflexis; valvis hispidis, concentrice striato- 

 rugosis, ab apice ad marginem posticum vix angulatis ; latere pos- 

 tico dilatato, rotundato. 



Lat. 6j lin,, alt. 4 lin. 

 Hab. Yobuko. 

 A compressed species, subquadrately ovate, with the beaks 



small and somewhat angulate, and with the posterior side dilated 



and rounded. 



Eucharis Gouldi, A. Ad. 



E. testa trigonali-elliptica, convexa, alba ; umbonibus antrorsum 

 valde inflexis ; valvis hispidis, concentrice rugoso-striatis, ab apice 

 ad marginem posticum rotundatis; latere postico declivo, sub- 

 angulato. 



Lat. 5^ Un., alt. ^ Un. 



Hab. Inland Sea, Mososeki. 



A somewhat trigonal species, with the beaks strongly inflexed, 



and the posterior area of the whorls rounded. 



