PISSUKELLA.— Plate IV. 



the rest, oritice nearly orbicular ; yellowish-white, 



rayed with ii-regular black spots, sometimes pinkish, 



interior greenish. 

 Lamarck, Anim.sans vert. (Deshayes' edit.) vol. vii. p. 595. 



Patella Barbadmsis, Gmelin. 

 Hab. West Indies. 



This is the ordiuaiy type of the species, which is ex- 

 tremely variable in colour, sometimes rose or pm'ple. 



Species 24. (Mus. Cuming.) 

 FissuKELLA NODOSA. Fus. testd ovato-conicd, latmbiis 



sttbcompressd, radiatim costatd, costis squamato-nodosis, 



nodis conspicuis, valde elevatis, orifieio oblongo, latius- 



ciilo, medio coarctato ; virescerde-albd. 

 The nodose Pisshkella. Shell ovately conical, a little 



compressed at the sides, radiately ribbed, ribs squa- 



mately nodose, nodides conspicuous, very elevated, 



orifice oblong, contracted in the midfUe ; greenish- 



wliite. 

 Lamarck, Anim.sans vert. (Deshayes' edit.) vol. vii. p. 593. 



Patella nodosa. Born. 



Patella spinosa, Gmelin. 



Patella Jamaicemis, Gmelin. 



Hab. West ImUes. 



Readily to be distinguished from all other species of 

 the genus by its very prominent erect squamate nodules. 



Species 25. (Mus. Cuming.) 



FissuRELLA viridula. Fiss. testd ovatd, siibconicd, an- 

 tice ittclinatd, costis subrvdibns lirisque obsolete iiodu- 

 losis radiatd, interstitiis in adolescentid canceUatis, 

 orifieio oblongo, medio coarctato, margine basali crenu- 

 lato ; viridi, costis albis, orificii Umbo caruleo. 



The GREEN Fissubella. Shell ovate, rather conical, in- 

 clined anteriorly, rayed with somewhat rude obscurely 

 noduled ribs and ridges, insterstices in the young 

 shell caneeUated, orifice oblong, contracted in the 

 middle, basal edge crenulatetl ; green, ribs white, 

 edge of the orifice blue. 



Lamarck, Anim. sans vert. (Deshayes' edit.)vol.vii. p. 596. 

 Testa juveuis. Fissnrella bicolor, Adams. 



Hab. Nevis, West Indies (attached to stones) ; Power. 



The scidpture of this species, which in the young state 

 is noduled and finely cancellated, becomes nearly oblite- 

 rated with age. 



