Mollusca from the Seas of China and Japan. 809 
with regard to the-position of the cartilage. I believe the place 
of the genus to be in Laseide. 
Thecodonta Sieboldi, A. Ad. 
T. testa oblonga, obliqua, valde inzequilaterali, convexiuscula, sub- 
incrassata, alba, concentrice sulcata, sulcis subdistantibus ; umbo- 
nibus parvis, latere antico breviore rotundato, postico longiore 
rotundato; margine ventrali simplici. 
Alt. 14 lin., lat, 24 lin. 
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 (Metocardia) Cumingi, A. Ad. 
B. testa transversa cordata, obliqua, cereo-alba, immaculata, concen- 
trice plicata, plicis validis, regularibus, eequalibus, angulatis, super 
carinam terminantibus ; latere antico brevissimo ; umbonibus par- 
vis; latere postico subacuminato, elongato, carinato; area postica 
tenuiter striata. 
Hab. China Seas. 
In form this species very much resembles Jsocardia Lamarckit, 
Reeve ; but the whorls are of a pure waxy white, the concentric 
plicee 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- 
tugosis, ab apice ad marginem posticum vix angulatis; latere pos- 
tico dilatato, rotundato. 
Lat. 63 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. 
#. 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. 54 lin., alt. 34 lin. 
Hab. Inland Sea, Mososeki.. 
A somewhat trigonal species, with the beaks strongly inflexed, 
and the posterior area of the whorls rounded. 
