6 



fub-carinated, does not quite reach the fummit of the fupe- 

 rior ones, but extends under the bafe at right angles, 

 becoming broader, and rounded at the margin, where it 

 unites with the pedicle, and is there wrought with concentric 

 ridges ; the whole ihell is covered with a very thin epidermis. 

 Length not quite an inch , 



Por.i.TCiprs Lcpas pollifipps rxmr.! Zy.9f. Y- ^sot? — Chem. Co7ich. \'m. ' 



Tab. 28, f. 5. t. 100. f. 551-55^. Turion Lin. iv. p. 171. 



Shell with numerous valves, five of which may be con- 

 fidered as primary, the fmaller or auxiliary ones furrounding 

 the bafe, which are more than twenty, are many of them 

 very minute ; all the valves are fmooth and gloify, the 

 largeft of the primary on each fide is rather concave, conic 

 at the upper part, with the fummit obtufe and perfectly 

 ftraight ; the anterior valve on each fide is ovate and very 

 convex ; the dorfal valve is fub-ovate, thick, convex, and 

 rounded : the greater part of the lelTer valves are triangular : 

 the pedicle is nearly double the length of the fliell, a little 

 comprefTcd, and of a mofl fingular texture, being covered 

 with an infinite number of fmall fcales, j)]aced in an im- 

 bricated form, completely concealing the Ikin which is 

 coreaceous ; thefe are in fubftance testaceous, refembling 

 ftiagrcen, of a cinereous-brown colour, and very glofly. 

 Length about two inches and a half, including the foot ftalk. 



This curious fpecies which by fome has been intitled 

 Cornucopia, has been taken more than once on the 



Briiijh 



