60 ZOOLOGY OF THE VOYAGE OF THE SULPHUR. 



suture always very decided, even in the living shells. This is smaller than the 

 foregoing, wants the fine golden colour, and has only a straight notch, for here it 

 is no more. 



FAMILY — AURICULACE/E. 



Scarabus. Montfort. 



244. Scarabus pollex, Hinds, Ann. Nat. Hist., vol. x. p. 82, (Plate XVI. fig. 9, 10.) Testa 

 ovata, compressa, fusco-castanea, longitrorsum valde striata ; striis subarcuatis ; anfractu ultimo 

 confuse fasciato. 



Inhab. Feejee Islands. 



In size it approaches S. Lessoni, but is distinguished from it by its coarsely 

 striated surface, and by its different markings. It is larger than S. castaneus, of 

 a much darker colour, more striated, and further characterized by the two dark 

 yellowish bands on the upper part of the last whorl. 



CONCHIFERM. 



Family — PectinacejE. 



Pecten. Da Costa. 



245. Pecten sericeus, (Plate XVII. fig. ].) Testa, orbiculari, plano-subconvexa, asquiauricu- 

 lata, velutina, valva sinistra planulata, prope umbonem subconcava, fusca, costis viginti-quatuor, 

 lateribus ad angulum planulatis, cum interstitiis velutinis ; valva dextra subconvexa, pallida, costis 

 consimilibus, interdum subgeminis ; auriculis sequalibus, rectis, velutinis, plicis duabus obsolelis ; 

 intus alba. 



Inhab. Bay of Panama. In fifty-three fathoms, on a muddy floor. A single 

 specimen only was obtained. 



246. Pecten floridus, (Plate XVII. fig. 6.) Testa, orbiculari, plano-subconvexa, aequiauricu- 

 lata.; valva sinistra planulata, prope medium subelevata, rufescente sparsim albo maculata, costis 

 viginti-duo ad latera compressis, superne rotundatis cum interstitiis laminis minimis epidermidis 

 transversim striatis; valva. dextra subconvexi, pallescente, costis quadratis, medio sulco impressis ; 

 auriculis sequalibus, rectis, lsevibus, epidermide indutis ; intus alba, versus auriculas et margines 

 saturate fusca. 



Inhab. San Diego, California. In five fathoms, among mud. 



