155 



culari intrinsecus atri-limbata ; margine smaragdino, eleganter 

 crenulato : incisura lata, modice profunda, intus in canalem ad 

 verlicem producta. Long. 4, lat. |, alt. {■ poll. Hah. Upolu. 



A very pretty species, somewhat resembling E. parmophoideay 

 Quoy, but differs in the dark coloring along the inner margin of 

 the muscular impression, forming the figure of a toadstool, and in 

 the greater development of the notch. 



Emargixula ossea. Testa crassa, rudis, albida, quadrangulari- 

 elliptica, costis radiantibus numerosis inequalibus aculis, et striis 

 increment! decussata; basi arcuato, margine crenulato; cicatrice 

 musculari bene impressa : incisura baud profunda, intus vix in 

 canalem producta. Long, -j;^, lat. 2^^, alt. -{jj poll. Hal. Feejee 

 Islands. 



Allied to E. austraUs, Quoy, but is much smaller and less 

 deeply checkered. 



Emarginijla cinerea. Testa cinerea, E. osseo similis, sed 

 tenuior, altior, magis disposite et delicate clathrata : cicatrice 

 musculari inconspicua : incisura minime profunda, in canalem 

 interiorem valde insignem producta. Lonji. f , lat. |, alt. f poll. 

 Hah. ? 



Similar to the preceding, but far less solid, and much more 

 regularly and delicately cross-barred ; and if the size of the 

 notch, the development of its canal, and the depth of the muscu- 

 lar impression, are important characters, they are certainly distinct 

 species. 



FissuRELLA CRATiTiA. Tcsta solida, elevata, ovalis, albida, 

 radiis fuscis ad 16 picta, lineis elevatis radiantibus et concentricis 

 sub-equalibus profunde imbricato-cancellata : apice sub-centrali, 

 intus alba ; margine inequaliter crenulato : foramen apicalis sub- 

 rotunda. Long. 2, lat. If, alt. ^ poll. Hah. Puget Sound. 



It has the general aspect of F. maxima^ but is sculptured like 

 F. Grceca. 



FissuRELLA VERNA. Tcsta soHda, striata, ovalis, symmetrica, 

 depresso-conica, cinereo-viridescens, atro-purpureo rad lata, costis 

 ad 20-30 sub-elevatis, planis, interstitiis adequantibus ; vertice 

 subcentrali, purpureo : fissura parva, ovalis ; margine crenato : 

 intus alliacea, fissurse limbo radiatim striate, purpureo marginato. 

 Long. If, lat. 1|, alt. ^ poll. Hab. Port Praya, St. Jago Island, 

 Cape de Verds. 



