66 ZOOLOGY OF THE VOYAGE OF THE SULPHUR. 



here the seniority is in favour of Conchology. As I am not aware that Conrad 

 has characterized his subgenus, or more than indicated it, anywhere, we are 

 unable to speak confidently as to its value or importance. The specimen chosen 

 for illustration is handsomely banded ; but the greater number of individuals are 

 of an uniform fawn colour. 



Family — Cycladace^. 

 Cyeena. Lamarck. 



273. Cyrena obesa, Hinds, Ann. Nat. Hist. vol. x. p. 81, (Plate XXI. fig. 6.) Testa ovata, 

 turgida, flavo-virente, transversim striata; natibus subintegris ; dentibus lateralibus serrulatis ; 

 latere antico convexo ; intiis pallide violacea. 



Inhab. In the rivers, Feejee Islands. 



The umbones of this shell are so perfect as to be nearly entire, and only 

 sufficiently erose to bear out one of the features which forms a portion of the 

 character of the genus. Towards the slope, the epidermis is thrown into several 

 small angular waves, and is everywhere of a fine yellowish green colour. 



274. Cyrena tenebrosa, Hinds, 1. c. p. 81, (Plate XXI. fig. 7.) Testa ovata, fusco-virente, 

 transversim striata ; natibus valde erosis ; dentibus lateralibus serrulatis ; latere antico rectiusculo ; 

 intiis violacea. 



Inhab. In the rivers, Feejee Islands. 



Both these species are from the same locality, and are not unlike. This is 

 flatter, of a darker colour, with some disposition to send an angle from the 

 umbones, which again are very erose. Within, on the broad extremity of the 

 valves, and towards the hinge, it is of a deep violet colour. 



Family — Nymphace^:. 

 Lucina. Brugutires. 



275. Lucina fenestrata, (Plate XIX. fig. 2.) Testa, orbiculari, complanata (junioribus eleva- 

 tioribus), albida, lineis longitudinalibus transversis decussatis cancellata et asperata, postice eruar- 

 ginata ; lunula lineari ; rnargine subcrenata. 



Inhab. Monte Christi ; San Bias. In seven to fourteen fathoms. 



Psammobia. Lamarck. 



276. Psammobia decora, Hinds, Ann. Nat. Hist, vol, x. p. 81, (Plate XIX. fig. 6, 7.) Testa 



