81 



latere siphonali brevi, valde flexuoso, infra angulato ; margine 

 ventrali pendulo ; cavositatis limbo albo, disco stilphureo ; denti- 

 bus lateralibus conspicuis. Long. £ ; alt. § ; lat. -/$ poll. Hab. 

 Feejee Islands. 



Very mucb like T. casta, Hanley, which is described as pel- 

 lucid, and no mention is made of the yellow color of the interior, 

 or of the two white umbonal radiations. One specimen is tinted 

 and zoned with rose red, and the interior is wholly red, preserv- 

 ing however, the umbonal white rays. 



Psammobia Florida. Testa transversa, oblonga, tenera, 

 polita, purpurascens, postice albo-radiata ; limbo epidermide 

 flavo-virescente induto; natibus postmedianis, inconspicuis ; latere 

 antico semi-elliptico, apice supra-mediano ; latere siphonali 

 angustato, acute rotundato, apice infra mediano ; margine ven- 

 trali rectiusculo : interior incarnata ; sinu siphonali angusto, 

 prselongo ; cardine dentibus duobus minutis divaricantibus 

 in utraque valva instructo. Long. 1£ ; alt. y 7 ^ poll. Hab. Illa- 

 warra, N. S. Wales. 



A shell closely resembling in structure and exterior coloring 

 Machcera costata. It has the form of P. vespertina, except that 

 the beaks are removed much farther backwards. 



Donax pallidus. Testa transversa, ovato-triangularis, solidula, 

 convexa, exalbida, postice concentrice sulculata, antice polita ; 

 umbonibus postmedianis; margine dorsali utrinque declivi (pra> 

 cipue retrorsum) convexiusculo ; latere antico semi-ovali, sensim 

 angustato, ad apicem rotundato ; latere postico sub-triangulari, 

 rotundato ; margine ventrali valde arcuato, postice sinuato : 

 interior eburnea, incrassata ; dentibus modicis. Long, f ; alt. % ; 

 lat. £ poll. Hab. Singapore. 



The outlines are all gently rounded, and the shell is other- 

 wise characterized by its dead, sallow-white color, and its sculp- 

 ture. 



Donax tinctus. Testa crassa, ovato-trigona, cuneata, ver- 

 sicolor, scilicet incarnata, straminea vel violacea, striis lamellosis 

 concentricis postice flexuosis insculpta ; umbonibus fere medi- 

 anis ; margine interiori integro ; dente laterali valido ; dente 

 antico obsoleto. Long. ££ ; alt. T 7 <y ; lat. | poll. Hab. 



It comes near to D. cuneata, but is still more like Mesodesma 

 11 



