908 Dr. Leacli on Cirripedes, 



UIIWENSIOffg. 



feet. in. line*. 



Total length 2 9 2 



Length of the head — 1 7 



Breadth of the head — 2 — 



Length of the body 1 1 — 



tail 1 6 5 



] fore leg & foot — 5 5 



' hind \e^ & foot — 8 — 

 longest claw . . . — • — 6 



On a comparison of this animal with the true Iguanas^ tlie 

 most striking and important discrepancy is in the form of the 

 head. Instead of the long, pointed, narrow muzzle of those 

 species, we have here a »hort, obtusely truncated head, not^ao 

 long as it is broad, the mouth consequently only capable of being 

 opened to a very short space. These circumstances, with the 

 shortness and equality of the toes, and the strength and curva- 

 ture of the claws, evidently indicate some striking peculiarity in 

 its food and general habits, on which however, in the absence of 

 all certain information, I shall abstain from offering any conjec- 

 ture. 



Art. XXIII. A Tabular view of the Genera composing 

 the Class Cirripedes^ with Descriptions of the Species of 

 Otion, Cineras, and Cli/ptra. By William Elford 

 Leach, M.D, F.R,S. i.S., S^c. 



Classis 1. Cirripedes. 



Ordo 1. Campylosomata. 

 Corporis basis pedunculiformis, tendinosa, flexilis; pars superior 

 valvis testaceis 4 aut 5 instructa, antice ad trausitum pedum 

 longitudinaliter incisa. 



Familia 1. Clytiad^. 

 Corpus supr^ nonnihil compressum, squamis quinque parvis pler- 

 umque linearibus instructura. 



