PLATY8TERA. 191 



and secondly, the two extreme aberrant types, which 

 are the rasorial and the natatorial, always shew such 

 a strong tendency to unite, that in such small groups 

 they reciprocally impart to each other some of their 

 characters. We see this in the genera Rkipidura 

 and MegalophuS) in the Fluvicolince and the Soon- 

 colince, and in Conopophaga and Lepturus. In these 

 two latter, the legs of hoth are remarkably long, but 

 in Conopophaga, as in natatorial types, they are syn- 

 dactyle, while in Lepturus, as in the Rasores, they are 

 free, and the lateral toes equal. In maintaining, there- 

 fore, the correctness of the foregoing table, wherein 

 long and short tailed birds are placed together as 

 mere species, we only follow that law which Nature 

 has manifested in so many other instances. 



No test can more fully substantiate the fact, that 

 the species of todies described at pages 173-178 

 really follow each other in the order we have placed 

 them, than a comparative table, wherein their ana- 

 logy to the sub genera of Todus are shewn. This 

 we now subjoin. 



Species repre- 



senting types Q 



of form in the ANALOGICAL CHARACTERS. '& nera 

 sub-genus Todu8 ' 



Todus. 



Todusviridis....\ T yP ic f ! representing the > T 

 \ sub-genus. 



Mdanocepbalus \ 

 ( 



bent. 



Unknown PLATYSTBRA. 



f Tail long, graduated feet, > , 

 " \ greatly lengthened. ) 



