Marine Shells from Trinidad. h\ 



Cardium Aurniferum^ Gu])py. PI. VII. fig. 3. 



Shell a little angularly suboval, moderately tumid: externally 

 marked with irregular orange-brown sjjots, and adorne(l with 

 thirty-five narrow imbricated ribs closely covered towards the 

 margins of the shell with numerous porcellaneous semitubular 

 tubercles, which are thicker anteriorly ; posterior edge nearly 

 straight, strongly serrate. Hinge-teeth J^i^r? strong. Interior 

 salmon-colour, growing wdiite towards the strongly dentate 

 margins, which are yellowish. Height b2 millims., length 45, 

 thickness 40. 



Hah. South coast of Trinidad {T. W. Carr). Found abun- 

 dantly at Grenada. 



Cardium hxiitense^ Sowerby, Quart. Journ. Geol. Soc. 

 vol. vi. p. 52, pi. X. f. 11. 



An oblique subovate shell, with 20-24 radiating, nodose, 

 rather square ribs wider than their finely crenate interstices. 

 Allied to C, subovale^ Brod. 



This was originally described by Sowerby as a fossil from 

 Haiti ; but I have dredged two small examples of it in the 

 Gulf of Pari a. 



Area centrota, Guppy, Proc. Scientific Assoc, of Trinidad, 

 p. 175 (Dec. 1867). PI. VII. fig. 4. 



This species was described as a fossil ; but I have since 

 ascertained that it is likewise living on our coasts, having been 

 collected by myself on the shores of the Gulf of Paria, and 

 by Mr. Carr on the south coast of Trinidad. Its umbones 

 are often pink or red, which colour is visible inside as well as 

 outside ; and the shell has a hairy epidermis, generally worn 

 off at the umbones. Height 17 millims., length 24. 



The following is the original description : — '^ Transversely 

 subrhomboidal, with a strong wide carination running from 

 the umbo to the posterior angle ; ornamented with many 

 (36-38) squamosely nodose radiating ribs, each with a fine 

 subsidiary thread-like rib in the narrow interstice ; anterior 

 margin short, rounded ; posterior margin strongly sinuate, 

 angulate above Avith the hinge-line, and forming a more rounded 

 angle with the strongly crenate low^er margin. Hinge-teeth 

 small in the middle of the straight hinge, but becoming larger 

 and diverging considerably towards the angles ; ligamental 

 area more or less grooved, especiallv anteriorlv."' 



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