32 



The lateral tooth is so larije, and bridges over the umbonal cavity so 

 peculiarly that a single valve might be taken for a specimen of Latia, 

 were it not for the cardinal range of denticles- which are like tenon 

 and mortise articulations, and not comblike, as in Nucula proper. 



LoRiPES KOTATA. T. solidula, flavescens, orbicularis, subglobosa, 

 striis concentricis irregularibus utrinque plus minusve coalescentibus 

 insculpta ; umbonibus medianis parvis ; lunula profunda, striis im- 

 pressis haud remotis inclusa ; margine interna concinne crenulata ; 

 cicatricibus profundls 5 sulco cardinali elongato ; dente cardinali 

 valido ; dente laterali postico parvo ; antico obsoleto. Diameter 59 ; 

 lat. 5 millim. Inhabits Loo Choo. W. S. 



GouLDiA DiLECTA. T. minuta, obliqua, rotundato-cordata, subglo- 

 bosa, alba, polita, antice admodum concentrice undulata ; umbonibus 

 submedianis ; margine interna simplici ; sinu palliali obvio. Long, et 

 alt. 4 ; lat. 2 millim. Inhabits Kagosima. W. S. 



The generic characters are well marked, and this is the only species 

 yet known from the Eastern Seas. 



Mysia (Felania) usta. T. oblique rotundato-ovata, lentlcularis, 

 crassa, concentrice undulata, epidermide piced durd induta ; umbonibus 

 vix antemedianis, acutis ; lunula parvd, lanceolatd ; extremitate antica 

 subcirculari ; extrem. posticd acutiori, obliqud ; ligamento conspicuo : 

 cavositas ex albo viridaus, costd ab umbone usque ad cicatricem 

 anteriorem munita ; margine interiori simplici; dente laterali antico 

 minimo vel obsoleto. Long. 30; alt. 27; lat. 15 millim. Inhabits 

 Hakodadi Bay, in sandy mud, 8 fath. W. S. 



It has the general aspect of Astarte, with its thick, dark epidermis, 

 but has the hinge of Mysia, subgen. Felania. 



Mysia dolabrata. T. parva, compressa, symmetrica, rotundato- 

 quadrata, Havescens, glabra ; umbonibus medianis, parvis, acutis ; 

 costa interna intra-umbonali exili, postice submarginali. Long. 10 ; 

 alt. 10 ; lat. 4 millim. Inhabits Simon's Bay, Cape Good Hope. 

 AV. S. 



Generally resembles Felania Senegalensis. 



Mysia figlixa. T. oblique rotundata, lenticularis, nitida, con- 

 centrice striolata, pallide argillacea ; umbonibus acutis vix antemedi- 

 anis ; disco intus calcareo ; dentibus cardinalibus validis ; costd inti'a- 

 umbonali oblicpid, satis conspicud. Long. 18; alt. 16; lat. 6 millim. 

 Dredged off the east coast of Japan, lat. 37°, in coarse, black sand, 

 20 fatlioms. W. S. 



Has a peculiar argillaceous look which may serve to distinguish it 

 from other species. M. dolabrata scarcely differs except in i)olish, 

 size, and obliquity of beaks. 



Mysia abijueviata. T. tenuis, fragilis, straminea, glabra, subglo- 



