FISSURELLA. 



Plate V. 



Species 26. (Fig. a, h, c, d, Mus. Cuming.) 

 FissuRELLA Peruviana. I'm. testdovata, antice attenu- 

 ata, elevatiuscula, interdum conicd, radiatim liratd, 

 liris sqiiamato-nodosis, interdum obsoletis, orifieio ovato, 

 parvo ; albidd, aut vivide rosed, aut purpureo-fusces- 

 cente, fmco vel purpnreo-nigricante radiatd, et circa 

 orijicimn eximii lentiginosd. 

 The PERUVIAN Fissurella. SheU ovate, attenuated 

 anteriorly, rather elevated, sometimes conical, ra- 

 diately ridged, ridges squamately nodose, sometimes 

 obsolete, orifice ovate, small ; whitish or bright rose, 

 or light purple brown, rayed with brown or purple- 

 black, and delicately freckled around the orifice. 

 Lamarck, Anim.sans vert. (Deshayes' edit.)vol. vii. p. .599. 

 Fissurella affinis. Gray, Sowerby. 

 Fissurella subrotunda, Deshayes. 

 Hab. Lobos Island, Valparaiso and Iquiqui, Peru ; Cuming. 

 So variable is this species in colouring it is almost in 

 vain to describe it, yet there is a marked affinity of design 

 in all the varieties, four- of which are selected for illus- 

 tration. 



Species 27. (Mus. Cimiing.) 



Fissurella alabastrites. Piss, testa ovatd, depresso- 

 conicd, radiatim costatd, costis incequalibus, subamplis, 

 orifieio oblongo, latimeulo, medio subcoarctato ; alid, 

 lined intense canded circa ori/icium iittiis e.vtusrjue, 

 orificii limbo virescente. 



The ALABASTER FissuRELLA. SheU ovate, depressly 

 conical, radiately ribbed, ribs uneven, rather large, 

 orifice oblong, rather broad, slightly contracted in 

 the middle ; wliite, with a dai-k blue Hue around the 

 orifice within and without, edge of the orifice 

 greenish. 



Hab. Cape de Verd Islands. 



A pure white rudely ribbed shell, in which the orifice is 



large, and of a pale sea-gi-een colour around the edge, 



bordered by a very deep indigo blue hne. 



The owl-eyed Fissurella. Shell ovate, depressed, 

 conical, radiately ribbed, ribs rather flattened, ob- 

 soletely nodose, with a smaU intermediate ridge, 

 oi-ifice small, oval ; white, edge of the orifice deep 

 indigo blue. 

 Hab. Cape de Verd Islands. 



The similarity between this and the preceding species, 

 both from the same locality, is remarkable ; yet they differ 

 materially in the shape and size of the dorsal orifice, and 

 ]Mi-. Cuming possesses several specimens of both, without 

 any intermediate modification of a character which appears 

 to be always constant in the same species. 



Species 28. (Mus. Cuming.) 

 Fissurella glaucopis. Fiss. testa ovatd, depresso- 

 conicd, radiatim costatd, costis subplanatis, obsolete 

 nodosis, lird pared intermedia, orifieio parvo, ovali ; 

 albd, orificii Umbo intense caruleo. 



August 



Species 29. (Mus. Cuming.) 

 Fissurella nimbosa. Fiss. testd ovatd, elevatd, declivi- 



conicd, radiatim liratd, liris incequalibm, orifieio oh- 



loncjo, 7/iedio coarctato ; virescente-albd, nigricante- 



viridi radiatd. 

 The rainy Fissurella. Shell ovate, elevated, steeply 



conical, radiately ridged, ridges uneven, orifice oblong 



contracted in the middle ; greenish-white, rayed with 



very dark green. 

 Lamarck, Anim. sans vert. (Deshayes' edit.) vol. vii. p. 591. 



Patella nimbosa, Linnaeus. 

 Hall. West Indies. Venezuela ; Dyson. 



The coloming of this species varies from brown to gi-een. 



Species 30. (Mus. Cuming.) 



Fissurella aspera. Fiss. testd ovatd, subconicd, antice 

 inclinatd, creherrime radiatim costellatd, costellis liris 

 cottcentricis squamatis eximie clathratis, orifieio sub- 

 orbicidari ; fidvo-dnered, liris cinereo-nigris. 



The rough Fissurella. Shell ovate, somewhat co- 

 nical, inclined anteriorly, veiy closely radiately ribbed, 

 ribs dehcately latticed with concentric squamate 

 ridges, orifice nearly orbicidar ; light fulvous ash, 

 ridges cinder-black. 



Sowerby, Pro. Zool. Soc, 1834. p. 127. 



Hah. Pacosmayo, Peru. 



Delicately sculptured, the transverse ridges passing 



over radiating ones in squamate festoons. 



