48 



divisa, concenfrice striata ; umbonibus perparvis medianis ; 

 margine ventrali Mante, rectiusculo, medio subsinuato. 

 Hab. Bay of Manilla, sandy mud, 5 fathoms. i\Ius. Cuming. 

 This is a small vvhite triangular shell with an impressed line in 

 the centre of the valves, and with the ventral margin gaping and 

 nearly rectilinear, although it is slightly notched in the middle. 



y^ 6. Leda electa, A. Adams. 



L. testą elongato-transversa, compressa, vix eequilaterali, lactea, 

 solidiuscula, utrinąue Mante ; latere antico acuminato, rotun- 

 dato, postico attenuato, rostrato, oblique subtruncato ; concen- 

 trice tenuissime plicato-lirata ; plicis posfice evanidis, distan- 

 tioribus, margine ventrali arcuato. 

 Hab. Santos, Brazil {Capt. Martin). Mus. Cuming. 

 This is a very beautiful milk-vvhite Leda, partaking, in many 

 particulars, of the character of F. crenifera and L. costeUata, 

 Sowerby. 



7. Leda siLiauA, Reeve. 



L. testą ventticosa, solidiuscida, subeequilaterali, epidermide nitida 

 fusca indata, concentrice tenuissime sulcatu ; umbonibus pro- 

 minentibus, latere antico rotundato, postico subrostrato, obliąue 

 truncato; area postica angulata, et carina obtusa ab umbonibus 

 ad marginėm ventralem extendente. 

 Hab. Arctic Seas {Sir E. Belcher). Mus. Cuming. 

 This is a fine pod-hke Arctic species, covered with a dark fuscous 

 epidermis, with the hinder side angulated and obUquely truucate, 

 and with an obtuse ridge exteuding from the beaks to the ventral 

 margiu. 



8. Leda concinna, A. Adams. 



L. testą tenuiuscula, compressa, lateribus Mante, pallide fusca, con- 

 centrice lirata, liris angustis, regidai-ibns, subdistantibus; latere 

 antico breviore ac rotundo, postico longiore ac rostrato; rostro 

 producto, tenui, subrecurvato, truncato; area lanceolata, an- 

 gusta, carina crenata utriusąue instructa. 

 Hab. New Zealand. Mus. Cuming. 



A rather thin eompressed species slightly gaping at both ends, of 

 a light browu colour, concentrically Urate, and with a slender beak 

 truncate at the end. 



9. Leda inornata, A. Adams. 



L. testą transversa,triangulari,ovata, gibbosula,fusca; umbonibus 



albidis, erosis; concentrice valide sulcata, latere antico breviore 



et rotundato, postico acuminato, subrostrato ; area lanceolata, 



lata ad lateribus angulata, margine ventrali regulariter arcuato. 



Hab. New Guinea. Mus. Cuming. 



This species is founded on a small, rather gibbose shell, covered 

 with a fuscous epidermis, from New Guinea, coarsely sulcate and 

 slightly beaked posteriorly. 



