358 Mr. Balwer 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. 



Isocardia. Lamarck. 



Testa aequivalvis, cordiformis, ventricosa ; umbonibus distan- 

 tibus, divaricatis, involutis. Dentes cardinales duo, compressi, 

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

 ticus elongatus. 



Ligamentum externum, divaricatum, segmentis sub umbonibus 

 decurrentibus. 



Impressiones musculares duae, laterales, distantes. Impressio 

 TOiUSCularis pallii sinu nullo. 



Spec. Isocardia CoTj,,. Lamarck, Anim. sans vertebres. torn, vi. 

 ^. JCt^2S^..--^1?. 31. 1. 



"^ Chama Cor, Linn. Grael. p. 3299. 



— Montagu Test. Britannica, &c. &c, 



/, testa cordato'globosuy l(evi^ fuha^ 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 apert^ ; postice 

 duobus brevibus siphonibus vel tubis ciliatis foraminibus superiori- 

 bus facit ; — color flavido-albus margine aurantiaco. 



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

 aurantiacus. 



Branchiae subflavae, externae, inter pallio et abdomine celatae. 



Corpus moUe testae valvis omnino inclusum. 



