COUCH S rOLYPRION. O 



of the head, teeth, and gill-covers, are detailed in the generic 

 characters ; the ventral and pectoral fins have their origin in 

 a vertical line under the fourth spinous ray of the dorsal fin : 

 the upper half of this fish is of a dark purplish brown, the 

 under part almost silvery white ; the membranes connecting 

 the various fin-rays dark brown ; the extreme margin of the 

 tail is nearly white. Young specimens are described and 

 figured as marbled over with two shades of brown ; the lateral 

 line rises high over the base of the pectoral fin, afterwards 

 following a course nearly parallel with the outline of the 

 back. The figure here given was taken from the specimen 

 of this fish sent me by Mr. Lowe, which measured sixteen 

 inches in length. The fin-ray formula is as follows : — 



D. 11 + 12 : P. 16 : V. 1 -f 5 : A. 3 + 9 : C. 17 : Vert. 26. 



A representation of the bones forming the cranium of this 

 Polyprion is here added as a vignette. 



