282 



Dredged oiF the coast of North Carolina. Coast .Survey. 



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

 ern coast, is quite diflferent from anything before described. 



GouLDiA FASTiGiATA. T. parvula, oblique triangularis, solidula, 

 flavida, concentrice arata prsecipue versus umbones; umbonibus acutio- 

 ribus antrorsum versis ; margine anteriori concava ; margine dorsali 

 arcuata ; marg. ventrali subrecto ; 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. 



LuciNA PUSiLLA. T. minuta, reniformis, straminea, concentric^ 

 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-aquilateralis, 

 omnino liris reflexis profundis arata ; extremitate antico late rotun- 

 dato ; extrem, postico acutissimo ; margine dorsali posticE concava, 

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

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



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



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 Coptocheilus. 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, circulare, planulatum. 



Type C. altum Sowb. and with it C. sectilabrum Gould, C. pauper- 

 culum Sowb., and C. funiculatum Bens. 



These species, which have been included in the genus Megalomas- 

 toma, are essentially different from the remarkable shells of the West 

 Indies coming under that genus, although the single species M. Antil- 

 larum has much the same character. Their habitat, general aspect, 

 and especially the double peristome, which is quite obvious posteriorly, 

 where the inner plate has a nick on one side or the other, give them a 

 marked affinity. They group with Tortulosa, Pupina, Registoma, and 

 similar eastern genera. 



