S6 PLAIN SYNBRANCHUS . 



skin of the body is thick and loose : the back is of 

 a deep olive-colour with dusky spots : the belly and 

 sides are of a yellowish cast, and the spots on those 

 parts have a tinge of violet : the dorsal, or rather 

 caudal fin, is extremely remote from the head, and 

 surrounding the tail unites with the vent-fin; the 

 vent being situated at the distance of some inches 

 from the end of the tail, which terminates acutely, 

 Native of the fresh waters of Surinam. 



PLAIN SYNBRANCHUS. 



Synbranchus Immaculatus. S.fuscus immaculatus. 

 Synbranchus of a plain unvariegated brown colour. 

 Synbranchus immaculatus. Block. 12. p* 77- t* 4? J p./. 1* 



This is much allied in general form to the pre- 

 ceding, but is considerably smaller, and very differ- 

 ent in colour, being nearly of an uniform brown 

 throughout, with the exception of a few very obscure 

 subtransverse dusky shades across the body, and a 

 few whitish marblings on the fins : like the former 

 species it is a native of Surinam. 



