174 



cxtus lirulis radiantibus subimpressis margincs versus conspicuis 

 disco obsoletis ; lineis increment] conspicuis remotis fluctuosis; intus 

 cicatricibus elongatis ; lines' palliali interrupts., punctata ; valvse alters 



dente cardinali subulato, lateralibus subobsoletis ; valvae alterae ? 



Long. o.7T>; alt. 3; lat. "_' niillini. Inhabits St. Simon's Bay. W. S. 

 Only one valve was found. The bands of growth are alternately 

 opaque and diaphanous, and the pallial Une is broken into dots as in 

 Lucina proper. 



(i:yi'todox polygoxius. T. parvula, tenuis, fragilis, lucida, 

 alba, globoso-quadrata, striis incrementi leniter insculpta ; umbonibus 

 medianis eminentibus, tumidis; extremitate antica acuta; extrem. 

 postica latiori, obbque truncata, angulo postero-ventrali acuto; mar- 

 gine ventrali et margine antica continuatim arcuata ; portionc postico 

 angulis binis radiato. Long. 4; alt. 3.5; lat. ;3 niillini. Inhabits 

 Simon's Bay. Cape Good Hope. W. S. 



It is larger, more equal in its diameters, thinner and more angular 

 in front than C. flexuosus. 



Scintilla tiioracica. T. parva, tenuis, lucida, nitida, elongata, 

 tumida, subovalis, minutissime. radiathn striata et fasciis concentricis 

 etiam punctis lacteis ornata; umbonibus antemedianis, minutis ; ex- 

 tremitate antica rotundata\ ; extrem. postica altiori, oblique subtrun- 

 cata; limbo tenuisshno ; cicatricibus bene impressis. Long. 13; alt. 

 8; lat. 4 niillini. Inhabits Ousima. W. S. 



Lucina (Myrtea) semintjla. T. minuta, crassa, albida, globoso- 

 triangularis, sulcis et laminis elevatis undulatis subcrenulatis ad ex- 

 tremitatibus fere spinosis insculpta ; umbonibus vix post-medianis ; 

 lunula cordata, profunda, et postiee fovea, ligamentali lanceolate 

 Lnstructis ; junctione dorsali antico angulato ; ab umbone adjunctionem 

 antero-ventralem striata; extremitate postica biangulata, sulco ab 

 umbone aream minus Insculptam secernente : eardo validus ; margine 

 interior] crassS penitus crenulata. Diam. 3 niillini. Inhabits Hong 

 Kong harbor. Common in 5-10 fathoms, shell sand. W. S. 



Remarkable for its great solidity and the depths of its sculpture. 



Lucina (Codakia) paiivula. T. oblique ovato-cordiformis, tenuis, 

 Qavescens, tumida, concentrice Iaminatc-lirata et radiatim striata, 

 striis utrinque excurvatis et interdum divaricantibus, intersectionibus 

 indentatis ; umbonibus elevatis, post-medianis; lunula excavatH; mar- 

 <_rinc interna exigue crenulata ; dente lateral] antico obsoleto. Long. 

 7 ; alt. 6 ; lat. 4 millini. Inhabits Port Lloyd, Bonin Island ; Loo 

 Choo; Hakodadi, in sand, to 20 fathoms. W. S., and Captain 

 Ttodgi rs. 



The characters are much the same in C. <>I>ti</n<t Rv., a much larger 

 shell. Specimens from Hakodadi are less deeply sculptured, and 



