100 Mr. S. Stutchbury on two new genera of Mollusca. 
to the cardinal pits: a nearly obsolete depressed line obliquely crossing 
the internal disk of each valve, from the umbones to the inferior margin. 
ANATINA CRASSA, 
Tas. Supp. xxim. f. 5, 6. 
A. testd crassd, subtrigond, inequivalvi, transversim costatd; valvd 
sinistrd convexiusculd, latere postico utriusque valve carinato ; de- 
pressione levi, cordatd, ad latus posticum umbonum ; impressioni- 
bus muscularibus profundis ; long. =8;, lat. 3,, alt. 755. 
Shell thick, subtriangular, inzequivalve, transversely ribbed ; left valve 
but slightly convex, posterior side of both valves carinated, with a 
smooth cordate depression on the same side of the umbones ; muscular 
impressions deep. Although the smallest species we have seen, it is 
probably the thickest of the genus. 
ANATINA OVALIS. 
Tas. Supp. xu. f. 7, 8. 
A. testd inequivalvi, tenui, pellucida ; latere postico brevi, truncato ; 
valvd dextrd convexd, margine superiore sulcatd, marginem inflecum 
alterius valve recipiente ; valvd sinistrd convexiusculd ; cartilagine 
cardinis internd, obliqud, elongatd : impressione pallii sinu magno ; 
long. 5, lat. 3,, alt. +8,. - 
Shell inzequivalve, thin, pellucid, posterior side truncated ; right valve 
convex, superior margin sulcated, receiving the inflected edge of the 
other valve ; left valve slightly convex. Hinge with an oblique elon- 
gate internal cartilage. Sinus of the impression of the mantle large. 
Now in the cabinet of Michael Bland, Esq. 
ANATINA ELONGATA. 
Tas. Supp. xi. f. 9, 10. 
A. testd transversim elongatd, inequivalvi, pellucidd ; sinu impressio- 
ms muscularis pallit versus latus anticum elongato; long. ;°, lat. 
ty alt. 3. 
Shell transversely elongate, inequivalve, pellucid, sinus of the im- 
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