LIST OF IRISH TESTACEA. 



505 



5. pellucida. (Plate xxiv. %.l.) Shell oblong-ovate, white, pel- 

 Incid, thin, and rather convex ; umbo small, 

 placed nearly central ; posterior side a little 

 truncated, and a Httle turned to one side ; 

 anterior side rotmded ; covered with a fine 

 transparent olivaceous epidermis ; pretty 

 strongly wrinkled concentrically, the wrinkles 

 more strong and sharp, and rather rugose, at 

 each end ; the outside is covered with a fine 

 waved striae at each end, but smooth towards 

 the centre of the valves ; from the umbo an 

 oblique furrow runs to the end of the ante- 

 rior slope ; in each valve is a spoon-like ca- 

 vity, sloping downwards, to which the carti- 

 ^ lage is fixed. Inside of a very fine pearl - 



aceous hue, and smoothly wrinkled, corre- 

 sponding with the outside. 

 Breadth, 1^ inch ; length, fths of an inch. 

 Two opposite valves, of different sizes, of this 

 shell, were found by Miss Hutchins at Ban- 

 try Bay, and are now in the cabinet of Dr 

 Taylor of Dublin, who obligingly favoured me 

 with them, to describe and draw from. 



d. margariti- Donovan, Brit. Shells, t. 73. — Wood, Gen. Con. 

 fera. 107. t. 23. f. 1, 2, 3. In the river Slany, 



Ennescorthy. 



7. inaequival- Montagu, Test. Brit. 38. Sup. t. 26. f. 7. — Linn, 

 vis. Trans, viii. 40. t. 1. f. 6. Dublin Bay, and 



Portmarnock. 



SOLEN. 



^. Vagina. A striking characteristic of this shell, which has 

 not been noticed by any author, is, that the 

 epidermis on each valve extends about half an 

 inch beyond the valves, on the sides farthest 

 .from the hinge. — Donovan, Brit. Shells, 

 K k 3 



