208 Dr. Leach on Cirripedes. 



DIMENSIONS. 



feet. in. lines. 



Total length 2 9 2 



Length of the head — 1 7 



Breadth of the head — 2 — 



Length of the hody 1 I — 



tail 1 6 5 



fore leg & foot — 5 5 



hind leg & foot — 8 — 



longest claw ... — — 6 



On a comparison of this animal with the true Iguanas, the 

 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 short, obtusely truncated head, not so 

 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. B^ William Elford 

 Leach, M.D. F.R.S. L.S., &fc. 



ClaSSis 1. CiRUlPEDES. 



Ordo 1. Campylosomata. 

 Corporis basis peduuculiformis, tendinosa, flexilis; pars superior 

 valvis testaceis 4 aut 5 instructa, antice ad tratisitum pedum 

 longitudinaliter incisa. 



Familia 1. Cr-YTiADiS;. 

 Corpus supra nonnihil compressum, squamis quinque parvis pler- 

 uraque linearibus instructum. 



