37 



acutis circumscripta ; portione antico ovato : cavositas salmonacea, 

 argentata ; denticulls anticis circiter 20; posticis 10. Long. 15; alt. 

 12; lat. 8 millim. Dredged off the east coast of Japan, lat. 37", and 

 at Hakodadi. W. S. 



The description of JV. mirabilis Hinds would apply in general to this 

 shell ; but in the figure, the postero-ventral junction is more acute 

 angled, and there are angular markings represented at the extremities. 

 In one of our specimens there is a double series of zigzags down the 

 disk. 



Leda cuspidata. T. parva, olivacea, concentrice sulcata, pyri- 

 formis, antice subglobosa, postice subito contracta, rostrata: umbonibus 

 paulum antemedianis ; area dorsali postica ampla, cristata, carinis sub- 

 marginalibus circumscripta; dentibus cardinalibus anticis 12, posticis 

 14. Long. 7; alt. 4 ; lat. 3 millim. Inhabits Hong Kong harbor, in 

 mud, 8 fathoms. W. S. 



Approaches nearest to Leda retusa. 



MoDiOLARiA CUPREA. T. trapezoidea, ventricosa, tenuis ; epider- 

 mide ochracea ; umbonibus obtusis ; extremitate antica insolite obtusa, 

 fere verticali ; margine dorsali lente arcuata, quoad marginem ventra- 

 lem fere rectam parallela ; extrem. postica obtusa ; valvis absque 

 angulis ; areis lateralibus tenuiter et inconspicue radiatis ; area 

 mediana glabra : cavositas margaritacea. limbo cupreo ; margine 

 interna crenulata. Long. 7 ; lat. 4 ; alt. 4.5 millim. Inhabits Kago- 

 sima Bay. W. S. 



An unusually short, quadrate species, and quite distinct in charac- 

 ters, so far as a single, not very f^esh specimen can be relied on. 



MoDiOLARiA EXPLETA. T. parvula, elongata, ovato-trapezoidalis, 

 dilute virens fusco marmorata ; umbonibus subterminalibus, acutis ; 

 extremitate antica acuta ; margine dorsali et marg. ventrali lente 

 arcuatis vix divergentibus ; extrem. postica obtusa ; valvis tumidis 

 ubique striis punctatis radiatis, ad aream medianam minus impressis ; 

 pagina interior margaritacea, marmorata ; margine interna utrinque 

 crenulata. Long. 6 ; alt. 4 ; lat. 2 millim. Inhabits Hong Kong 

 harbor. W. S. 



The striation of the median area is peculiar to this species, so far 

 as I know, bringing it near to AI. pectinula G. 



MoDiOLARiA VARicosA. T. tenuis, compressa, ovato-trapezoida- 

 lis, dilute viridis, lincis fuscis angulatis ornata ; umbonibus terminali- 

 bus ; extremitate antica acuta, marginibus arcuatis divergentibus ; 

 extrem. postica rotundata ; areis lateralibus striis frequentibus radi- 

 antibus impressis ; area mediana striis concentricis vel etiam striis 

 radlantibus solum insculpta : pagina interior nacrea lineis angulatis 

 rufis perlucentibus. Long. 9 ; alt. 6 ; lat. 2.5 millim. Inhabits Syd- 

 ney, New South Wales. W. S. 



