FISSURELLA. 



Plate XI. 



Species 73. (Mus. Cuming.) 



FissuRELLA xEois. Fiss. testd ohlongd, depressd, parum 

 elcvald, liris radiantibns subcequalibus numerosis con- 

 ferfls, l/M'isf/ne coiiceidricis nitide squamato-cancellutd, 

 orijicio oblotigo, sicbampio, cintice incUnalo ; albd, vi- 

 rescenle-o/imceo sitbobscure hdiradiatd. 



The jEgis Fissueella. Shell oblong, depressed, but 

 little raised, neatly squamately cancellated with nu- 

 merous close-set nearly equal ridges and concentric 

 lines, orifice oblong, rather large, inclined anteriorly ; 

 white, rather obscurely broadly rayed with greenish- 

 olive. 



Hab. ? 



A beautifully-sculptured species, having very much the 



form of a Parmopkorus. 



Species 73. (Mus. Cuming.) 



FiSSURELLA ATRATA. Fiss. tedd omld, (Ullliv ill U'liuilld, 



depresso-plmid, medio elevatiuscidd, obxnldr lirimJidli', 

 liris marrjinem versus obscure >iodu/ui/s, vnjirio ob- 

 louffo, lateribus subcontractis ; intense purpureo-atrd, 

 circa orificium. cdbd, atro radiatd, margine interuo 

 late purpureo-atro . 



The inky Pissurella. Shell ovate, attenuated ante- 

 riorly, depressly flattened, slightly raised in the 

 middle, obsoletely rayed with ridges, which are ob- 

 scurely nodulous towards the margin, orifice oblong, 

 slightly contracted at the sides ; deep purplc-lilack, 

 white, rayed with black around the orifice, internal 

 margin broadly purple-black. 



Jlab. ? 



Belonging to the Peruvian type with broad inner 

 margin, F. Udiiiiargiiiata, BriJgesii, &c., but specifically 

 distinct. 



Species 71. (Mus. Cuming.) 



FiSSURELLA EXQUISITA. Fiss. testd ovatd, aidice vix at- 

 tenuatd, tenui, depressiusculd, medio elevatd, radiatim 

 crebriliratd, liris subirregularibus, corrugatis, obscure 

 nodulosis, or/Jiriu pmnii/j/o, lateribus coutracto ; fla- 

 vescente-albd, iiiiriiiirt'ihiiiijricante conspicue el regu- 

 lariter radiuld, margine interno tessellato. 



June 



The EXQUISITE Pissurella. Shell ovate, scarcely atte- 

 nuated anteriorly, thin, rather depressed, raised in 

 the middle, radiately closely ridged, ridges somewhat 

 ii-regular, corrugate, obscurely nodulous, orifice very 

 large, contracted at the sides ; yellowish-white, con- 

 spicuously regularly rayed with purple-black, in- 

 ternal margin tessellated. 



llab. Strait of Magalhaens. 



A very characteristic species, in which the orifice of 



true key-hole form is unusually large. 



Species 75. (Mus. Metcalfe.) 



Flssurella Metcalfii. Fiss. testd oblongo-omtd, de- 

 pressiusculd, medio levald, radiatim liratd, liris rmme- 

 rosis confertis, snbavgnlatis, striis conceidricis undique 

 crchi:rrii,ir drnixsulis, orijicio oblonyo-ovato, medio sub- 

 crriiridii, mdic- incliindo, margine deuticulato, denti- 

 cii/i.s l/ic illir bijiilin; cirescente-albd, olivaceo inter- 

 ruple latirudiutd. 



iMetcalfe's Fissdrella. Shell oblong-ovate, rather 

 depressed, raised in the middle, radiately ridged, 

 ridges numerous, elose-set, slightly angled, very 

 closely decussated throughout with concentric strise, 

 orifice oblong-ovatc, slightly excavated in the middle, 

 inclined anteriorly, margin denticulated, denticles 

 here and there bifid ; greenish-white, interruptedly 

 broadly rayed with olive. 



JM. ? 



The ridges, which are very numerous and close-set, are 



slightly angular, and very closely festooned throughout 



witii concentric stride. 



Species 76. (Mus. Cuming.) 



FiSSURELLA CLYi'EUS. Fiss. testd ovatd, crassitisculd, 

 depressd, obscure radiatim liratd, liris distantibus, 

 obsolete muricato-nodosis, orijicio oblongo-ovato, par- 

 viusculo ; albidd, ustulato-nigro peculiariter reticulato- 

 radiatd, margine interno tessellato. 



The shield Fissurella. Shell ovate, rather thick, 

 depressed, obscurely radiately ridged, ridges distant, 

 obsoletely ]n-iekly nodose, orifice oblong-ovate, rather 

 small ; whitish, peculiarly rayed in a reticulated 

 manner with bui-ut-black, internal margin tessellated. 



1850. 



