239 



Semele oknata. T. parva, elliptica, rubescens prope marginem 

 rosaceo concentrice et radiatim tincta, concentrice costato-striata et 

 radiatim striata presertiin ad umbones et versus extremitates : plica 

 satis conspicua : eavositas flavo et sanguineo tincta admodum radiata ; 

 dentibus prsecipue validis. Inhabits the coast of Georgia. 



Similar in form and sculpture to the preceding, but different in 

 coloration and hinge. 



Ervilia concentrica. T. minute, oblongo-ovata, pellucida, 

 nitida, (senioribus, incrassatis, margaritaceia) confertim sed profecto 

 concentrice arata; umbonibus paullo postmedianis ; extremitate antico 

 acutiori quam extremitate postico. Long. 6 -\- ; alt. 4 ; lat. 3 millim. 



Dredged off the coast of North Carolina. Coast Survey. 



This little shell, which seems to be abundant along the whole South- 

 ern coast, is quite different from anything before described. 



Gouldia fastigiata. T. parvula, oblique triangularis, solidula, 

 flavida, concentrice arata prascipue versus umbones; umbonibus acutio- 

 ribus antrorsum versis ; margine anteriori concava ; margine dorsali 

 arcuata ; marg. ventrali snbrecto ; angulo ventrali antico fere recto ; 

 ang. postico rotundato. Long. 8 ; alt. 8 millim. 



From Frying-pan Shoals, N. Car. Coast Survey. 



Another species of the genus established to receive the little Astar- 

 toid shells, with more or less developed lateral teeth. 



Lucixa tusilla. T. minuta, reniformis, straminea, concentrice 

 leviter striata ; umbonibus postmedianis, eminentibus ; margine dorsali 

 anteriori excavato, extremitate rotundata, retusa ; extrem. postica late 

 rotundata, subtruncata ; intus radiatim striata, radiis versus umbones 

 evanescentibus. Long. 3 ; alt. 2, 5 millim. 



From the coast of North Carolina. Coast Survey. 



This very minute species has the form of the subgenus Codakia, 

 but is destitute of the divaricate striation. It approaches the genus 

 Lasea. 



Leda unca. T. parvula, solidula, rufescens, sub-a^quilateralis, 

 omnino liris reflexis profundis arata ; extremitate antico late rotun- 

 dato ; extrem. postico acutissimo ; margine dorsali postica concava, 

 cristata, levigatil ; marg. ventrali postice sub-emarginata ; denticulis 

 utrinque 12-15. Long. 8+ ; alt. 6 ; lat. 4 millim. 



From Frying-pan Shoals, N. Carolina. Coast Surrey. 



This small, acutely rostrate species greatly resembles one from the 

 Bay of Bengal. The specimens examined were destitute of epider- 

 mis, and probably worn. 



Genus Coptociieiltjs. T. chrysalidiformis, acuta, arete perforata, 

 castanea ; apertura a spira fere disjuncta ; peristomate plus minusve 

 duplici, lamina interna postice incisa. Operculum (C. altum) cor- 

 neum, multispirale, circu'are, p'anulatum. 



