36 



LuciNA (Myrtea) seminula. T. minuta, crassa, albida, globoso- 

 triangularis, snlcis et laminis elevatls undulatis subcrenulatis ad ex- 

 tremitatibus fere spinosis insculpta ; umbonibus vix post-medianis ; 

 lunula cordata, profunda, et postice fovea Hgamentali lanceolata 

 instructis ; junctione dorsali antico angulato ; ab umbone ad junctionem 

 antero-ventralem striata; extremitate postica blangulata, sulco ab 

 umbone aream minus insculptam secernente : cardo validus ; margine 

 interiori crassa penitus crenulata. Diam. 3 millim. 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) parvula. T. oblique ovato-cordiformis, tenuis, 

 flavescens, tumida, concentrice laminato-lirata et radiatim striata, 

 striis utrinque excurvatis et interdum divaricantibus, intersectionibus 

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

 gine interna exigue crenulata ; dente laterali antico obsoleto. Long. 

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

 Choo; Hakodadi, in sand, 6 to 20 fathoms. W. S., and Captain 

 Rodger s. 



The cliaracters are much the same in C. obliqiia Rv., a much larger 

 shell. Specimens from Hakodadi are less deeply sculptured, and 

 perhaps more orbicular ; but on the whole the differences are not 

 enough to warrant a separate description. 



YoLDiA OBTUSA. T. tcuuis, glabra, dilute flavo-virens, transversim 

 ovalis vel potius subcrescentica, tumida ; umbonibus parvis ad trien- 

 tem sitis ; extremitate antica acuta ; margine dorsali postica recta 

 demum declivi ; extrem. postica rotundata ; margine ventrali valde 

 arcuata ; area dorsali angusta hand circumscripta ; cardine debili, 

 denticulis anticis 20, posticis 24 instructo. Long. 16; alt. 9; lat. 6 

 millim. Inhabits Hong Kong harbor, in mud, 6-10 fathoms. W. S. 



Generally resembles Y. sapotilla G. but is less attenuated than any 

 species I have seen. 



NucuLA PARVULA. T. minuta, flavescens, ovato-cuneata ; disco 

 trlabro, limbo striis exilibus confertis radiato; umbonibus tumidis, 

 post-medianis; extremitate antica acuta admodum nasuta ; extrem. 

 postica rectangulari ; margine interna crenulata. Long. 2 ; lat. 1.5 ; 

 alt. 1.5 miUira. Hong Kong harbor, in 8 fathoms, muddy bottom. 



w. s. 



Allied to N. nana Hinds. 



NucuLA (AcilaJ iNSiGNis. T. magna, solida, oblique ovato-trian- 

 gularis, ventricosa, sulcis e linea mediaiia divaricantibus interdum 

 prope marginera bifurcatis arata, epidermiih^ olivacea induta; umboni- 

 bus posticis, fere terminalibus, conspicuis ; extremitate posteriori ver- 

 ticali, angulo ventrali obtuso, area dorsali depressa, cristata, vallibus 



