50 



postico longiore, superne subangulato, inferne obliąue rotundato; 

 area lanceolata, utrinque carinata. 

 Hab. Philippines. Mus. Cuming. 



This is a shining, pale fulvous, finely sukate species, with the 

 hinder side rather acutely angulated above and obliquely rounded 

 below, and vi-itb the lanceolate area lidged on eacb side. 



15. Leda decora, A. Adams. 



L. testą transverso-oblonga, crassa, solida, utrinque subhiante, 

 sordide alba,conferte et valde concentrice sulcata; latere aiitico 

 rotundato, postico rostrato; rostra recurvato et obligue subtrun- 

 cato; area lanceolata, depressa, carina valida crenata utriusąue 

 instructa. 

 Hab. West Indies. Mus. Cuming. 



A transversely elongate species, with a strong crenate keel on eacb 

 side of the lozenge, and somevvbat resembling iu appearance the 

 L. crenifera of Sowerby. 



16. Leda fulgida, A. Adams. 



L. testą transversim ovata, Icevi, pallide fusca, micante, perventri- 

 cosa; antice breviore et rotundata,postice acuminuta et rostrata; 

 rostro subrecurvo, margine ventrali regulariter arcuato. 

 Hab. Port Essington. Mus. Cuming. 



Tbis is a smootb, shining, pale-brown sbell, very ventricose, 

 rounded and sbort anteriorly and rostrate posteriorly, and witb the 

 rostrum rather recurved. 



17. Leda semisulcata, A. Adams. 



L. testą transversim oblonga, compressiuscula, lactea, nitida, con- 

 centrice sulcata, suleis ad partem posticam obsoletis; umbonibus 

 acutis, subcentralibus ; latere anfico breviore, rotundato, postico 

 acuminato, non producto ; nymphis prominentibus, obligue sul- 

 catis ; margine ventrali regidariter arcuato. 

 Hab. Borneo. Mus. Cuming. 



A shining, rather compressed, milk-white shell, with the sulci 

 obsolete on the posterior half, and witb the hind side acuminate but 

 not produced. 



18. Leda pmcifera, A. Adams. 



L. testą transverso-oblonga, alba, nitida, subventricosa, oblique 

 sulcata ; latere antico rotundato, plicis 3-4 validis radiatitibus 

 instructo, latere postico carina obliqua ab umbonibus ad mar- 

 ginėm ventralem extendente ; area lanceolata, carina crenata 

 duplici utrinque instructa; margine postico truncato et valde 

 emarginato, margine valvarum siniplici. 

 Hab. China Seas. Mus. Cuming. 



Strongly notched at the hind margin, and with three or four plicse 

 at the anterior part, and with a double crenate keel on eacb side of 

 the lunule. 



19. Yoldia lepidula, A. Adams. 



T. testą transversa, oblonga, utrinque Mante, tenui, inceąuilaterali ; 



