New Species of Anatina. ^ 



Anatina brevis. 

 Tab. Supp. xliii. f. 1, 2. 

 A. testa, plano-convexd, sub-triangidari, transversim striatd^ valvd dex- 

 trd convexd, costis duabus depressis, transversim lamellosis, supra 

 extremitatem posticam positis ; valvd altera subconcavd, margine 

 dorsali inflexo et in sulcum alterius valve inserto : cardine cartila- 

 cjine internd trigond et appendice testaced intermedid : umbonibus 

 postice rejlexis : impressionibus muscularibus distantibus, laterali- 

 bus : imprcssione pallii sinu lunari ; long, if » lat. rf^, alt. j-^. 



Shell plano-convex, subtriangular, transversely striated. Right valve 

 convex, with two depressed transversely lamellated ribs upon the posterior 

 extremity. Left valve slightly concave, dorsal margin inflected, and in- 

 serted into a sulcus in the opposite valve. Hinge with an internal trian- 

 gular cartilage, and a supervening small shelly piece. Umbo reflected 

 posteriorly.* Two distant muscular impressions ; a lunate sinus in the 

 impression of the mantle. 



A figure of this shell was given by Mr. G. B. Sowerby, in his Appen- 

 dix to my Sale Catalogue as Pandora brevis, the cardinal appendage 

 beuig overlooked by him, or (which is more probable) it was lost before 

 he had the shell. 



Anatina Pandoriformis. 



Tab. Supp. xliii. f. 3, 4. 

 ./^. testd plano-convexd, subovatd, striis transversis distantibus ; valvd 

 dextrd convexd, extremitate posticd carinatd truncatd ; valvd alterd 

 subconcavd : cardine appendice pland fossulis cardinalibus cartila- 

 gine adhcerente ; lined depressd subobsoletd, internd, ab umbone 

 versus marginem inferiorem obliquk decurrente ; long, -x^, lat. -^, 

 ah. ^-j. 



Shell plano-convex, subovate, with transverse distant striae. Right 

 valve convex, the posterior extremity carinated and truncated ; left valve 

 slightly concave. Hinge with a flat testaceous piece attached by cartilage 



* Contrary to every other genus examined, applying the term posterior to 

 the side where the siphons are situated. 



G 2 



