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NATURAL SCIENCES OF PHILADELPHIA. 121 



2. C. crocea, Lam. Anim. s. Vert. Reeve, Icon. sp. 9. 1862. 



(Var.) C. Cumingii, Reeve, Icon. sp. 7. 1862. 

 (Var.) C. ferruginea, Reeve, Icon. sp. 8. 1862. 



Philippines. 



3. C. gigas, Linn. Syst. Nat. Reeve, Icon. sp. 1. 1862. 



C. mutica, Lam. Anim. s. Vert. 

 C. rudis, Reeve, Icon. sp. 4. 1862. 



Indian and Pacific Oceans. 



4. C. serrifera, Lam. Anim. sans Vert. Reeve, Icon. sp. 6. 



1862. 



Moluccas. 



5. C. squamosa, Lam. Anim. sans Vert. Reeve, Icon. sp. 3. 



1862. 



Moluccas. 

 Doubtfully distinct from C. gigas, Linn. 



Genus HIPPOPUS, Meuschen. 

 Mus. Gevers, 488. 1787. 



Pelvis, Muhlf. Entwurf. 67. 1811. 

 Cerceis, Gistel, Naturg. 172. 1848. 



1. H. Hippopus, Linn. (Chama.) Linn, Syst. Nat. Ed. xii. 1137. 

 H. equinus, Meuschen, Entwurf. 67. 1811. 

 H. maculatus, Lam. Anim. s. Vert. Reeve, Icon. sp. 1. 

 1862. 



Eastern Seas. 



