358 Mr. Bulwev on the Isocardia Cor of the Irish Seas. 



Should the few observations I then made, and which I now 

 enclose, appear to you to be worth inserting in the Zoological 

 Journal, you are at liberty to give them a place whenever you 

 please. 



I remain, dear Sir, 



Yours, faithfully, 



James Bulwer. 



IsocAKDiA. Lamarck. 



Testa aequivalvis, cordiformis, ventrlcosa ; umbonibus distan- 

 tibus, divaricatis, involutis. Dentes cardinales duo, compress!, 

 intrantes, unus sub utroque umbone recurvus. Dens lateralis pos- 

 ticus elongatus. 



Ligamentum externum, divaricatum, segmentis sub umbonibus 

 decurrentibus. 



Impressiones musculares duae, laterales, distantes. Impressio 

 rauscularis pallii sinu nullo. 



Spec. Isocardia Cor, Lamarck, Anim. sans vertebres. tom. vi. 

 p. 31. 1. 

 Chama Cor. Linn. Gmel. p. 3299. 

 . Montagu Test. Britannica, &c. &c. 



/. testa cordalo - globosd, Icevi, fulvd, umbonibus albidis fusco 

 fulvoque nebulosis. 



Animal. — Pallium amplum, testae faciem interiorem omnino 

 tegens ; externo margine duplice est ; plica exteriore antice divisa, 

 interiore fronte conjuncta utraque extremitate aperta ; postice 

 duobus brevibus siphonibus vel tubis ciiiatis foraminibus superiori- 

 bus facit ; — color flavido-albus margine aurantiaco. 



Pes valde muscularis, latus, triangularis, compressus, cuspidatus, 

 aurantiacus. 



Branchice subflavae, externae, inter pallio et abdomine celatae. 



Corpus molle testae valvis omnino inclusura. 



