82 



striata in general aspect. The specimens I have examined 

 vary greatly in color, but correspond in form, sculpture, and 

 other characters. 



Donax crocatus. Testa parva, tenuis, transversa, ovato-tri- 

 angularis, inequilateralis, dilute crocea, concentrice lamelloso- 

 sulcata ; latere antico semi-ovato; latere postico breviori, rotun- 

 dato-truncato ; margine ventrali lente arcuato : intus flavida, 

 nitida ; cardine valido. Long, f; alt. ^ ; lat. ^ poll. Hab. 

 Mangsi Island. 



This small species is sufficiently well characterized, somewhat 

 like D. scalpellum. 



Lucina kamulosa. Testa crassa, scabra, lenticularis, vix 

 obliqua, albida, costulis radiantibus crebre divaricantibus et fi lis 

 continuis concentricis crebris insculpta ; umbonibus elevatis 

 acutis antrorsum versis ; lunula excavata, haud insculpta : ca- 

 vositas albida vel citrina, incrassata ; cicatricibus profundis ; 

 limbo concinne radiato-striato ; cardinis dentibus lateralibus vali- 

 dis. Diam. 1 ; lat. ± poll. Hab. Paumotu Islands. 



As much allied to L. tigerina or L. interrupta as to any 

 described species, but is more circular, more solid, and the 

 peculiar divergence of the radiating ridges, somewhat like 

 Cytkerea divaricala, are sufficiently characteristic. 



Lucina inculta. Testa tenuis, lenticularis, retrorsum admodum 

 obliqua, stramineo-albida, concentrice striolata ; natibus medianis, 

 elevatis, acutis, contiguis, antrorsum versis ; latere antico 

 superne subangulato, excavato ; latere postico rolundato, infra 

 paululum producto: cavositas albida; cicatricibus perspicuis : 

 cardo invalidus ; dentibus apicalibus duobus divaricatis, laterali- 

 bus nullis. Diam. % ; lat. f poll. Hab. New Zealand. 



Very much like L. jilan, but much smaller, more solid, and 

 less glossy. The anterior end is less developed, and the bulk 

 of the shell, as well as its most depending portion, is behind, 

 instead of before, the beaks. 



Lucina vesicula. Testa tenuis, sub-globosa, vix obliqua, pal- 

 lide flavescens, concentrice tenui-striata, radiatim obsolete stri- 

 ata : natibus submedianis, elevatis, anteversis ; margine dorsali 

 antice excavato, demum subalato, postice rectiusculo ; peripheria 

 reliqua circulari ; cardine edentulo ; ligamento in fossam obli- 



