470 DR JOHN ALEXANDER SMITH ON CALAMOICHTHYS, 



Of body at the distance of one inch behind the pectoral fins, |i of an inch. 

 N.B. — The body continues of the same breadth onwards to beyond the 

 first dorsal finlet, after which it gradually diminishes towards the 

 caudal extremity. 

 Of body at the second dorsal finlet, about ^ of an inch. 

 „ at the sixth dorsal finlet, about -£> of an inch. 

 „ at the ninth dorsal finlet, about -^ of an inch. 

 Of caudal extremity, -^ of an inch. 



Depth, or Perpendicular Measurements. 

 t 

 Of head, at pre-operculum, -^ of an inch. 



Of body, at the origin of pectoral fins, - 2 % of an inch. 



at the distance of one inch behind the pectoral fin-rays, \ of an inch. 



at first dorsal finlets, ^ of an inch. 



at second dorsal finlets, I of an inch. 



at sixth dorsal finlets, about £ of an inch. 



at ninth dorsal finlets, ^j of an inch. 



at posterior margin of anal fin, J of an inch. 

 Greatest breadth across caudal fin-rays, f of an inch. 



Additional Specimens of the Male Fish, and Varieties in Character. 



Six other specimens of the male fish were examined ; they varied in length 

 from about 8 to 10 inches. They also varied in some of their minor characters. 



Dorsal finlets.— -The dorsal finlets ranged from nine to eleven in number, and 

 this variety occurred independently of the length of the fish ; the longest fish not 

 having necessarily the greatest number of dorsal finlets. They also differed, in 

 the relation of the last dorsal finlet, to the caudal fin-rays ; in some cases it was 

 attached by its finlet to the base of these fin-rays, and in others it was quite 

 distinct from them ; and this last dorsal finlet had in some cases a hard fin-ray, 

 like those of the tail, and in other cases a soft one, like those of the other dorsal 

 fins. The dorsal finlets in these specimens varied also in their distance from one 

 another ; in some the distance between the finlets gradually diminished from 

 before backwards, and in other specimens, again, the finlets at each extremity 

 of the body were closer to one another than those occupying the middle of the 

 range. When the finlets are more numerous, they rise nearer to the head of the 

 fish than in those specimens in which they are fewer in number ; thus, in a fish 

 measuring 9^ inches in length, with eleven dorsal finlets, the first one is at the dis- 

 tance of 3 T 8 F from the point of thesnout. Any specific character of this fish, derived 

 from the dorsal finlets, will therefore require to allow a considerable variety both 

 in their number, their relations to one another, and also to the caudal extremity. 



Scales. — The scales on the body are arranged in a series of single rows 





