290 PROCEEDINGS OP THE ACADEMY OP 



M. 

 Total length . . . . , . . . .0.041 



Length to opercular edge 0078 



" pectoral fin 008 



" dorsal 0158 



" anal 0245 



" caudal 033 



From the Ambyiacu, Jno, Hauxwell, 



PAKIODON MICROPS, Kner. 



Sitzungsb. Wien. Acad., 1855, p. IGl. Giinther, Catal. B. Mus. v. 375. 



A fine specimen of this fish was obtained by Robert Perkins. 

 It is nearly allied to Stegophiliis Rhdt., and belongs to the Stego- 

 2')hilina of Giinther. The latter author, however, places it in his 

 Trichomycterina, a step calculated to mislead the student, as it 

 contradicts its natural characters. Giinther does not appear to 

 have seen the fish, and perhaps Kner omits mention of the cha- 

 racters necessary to decide the question. It possesses the very 

 posterior vent, and the gill covers united with the throat found 

 by Giinther to define the Stegophilina. 



SYMBRANCHIDiE 



SYMBRANCHUS MAEMORATUS, Bl. 



The fishes of the Ambyiacu, so far as made known by the pre- 

 ceding investigation, are referable to eight families, fifty genera, 

 and seventy-four species. These are distributed as follows : — 



Gen. Species. 



Chromidid^, t 15 



Clupeid^, 1 1 



osteoglossid^, 1 1 



Sternopygid^, 2 3 



Erythrinid^e, 2 2 



Characinid^, 21 29 



SlLURID^, 15 24 



Symbranchid^, 1 1 



Fort3'-seven of the above species and nine of the genera are 

 new to science, and are referable to the following families : — 



[February 13, 



