CYPRINOIDE^l. 



119 



Fins.— Br. 3—3 ; P. 16; D. 14 ; V. 9 or 10 ; A. 9; C. 18f. 



The dorsal fin is larger than in the foregoing two species, and is nearly in the middle of the 

 fish. The pectorals measure rather less than one-fifth of the distance between the gill-open- 

 ings and caudal fin. The ventrals are under the middle of the dorsal. The tip of the anal, 

 when turned back, rather overlaps the base of the caudal : its last ray is very small, and its 

 first one short and applied to the base of the second. The caudal is more forked than in the 

 preceding species. The rays of all the fins are thick, particularly those of the anal. 



Intestines. — Lining of the abdomen white. There is no distinction between the stomach 

 and rest of the gut. The alimentary canal makes four convolutions between the gullet and 

 anus, and bears a proportion to the total length of the fish, excluding the caudal, of 41 to 16. 

 The lining of the intestine has the same minute longitudinal rugae as that of the preceding 

 two species. The air-bladder is divided into three portions, the central one being the largest, 

 and communicating with the oesophagus. The upper one alone has a thick shining capsule. 



Dimensions. 



Length from snout to tips of caudal 

 ,, caudal . 



Inches. 

 . 19 

 16 

 . 12 



Greatest depth of body . 



,, circumference . 

 Length of alimentary canal 



Inches. 



. 12 



5 

 . 41 



[55.] 4, Cyprinus (Catastomus) aureolus. (Le Sueur.) Gilt 



Sucking- Carp. 



Catastomus aureolus. Le Sueur, Journ. Ac. Sc. Phil., i., p. 95. An. 1817. 



M. Le Sueur, who discovered this fish in Lake Erie, gives the following account 

 of it, which we quote because no specimen came under our notice. 



" Anal fin long, pointed, and passing considerably beyond the base of the caudal, which is 



forked with pointed lobes, the inferior lobe being the largest : abdominal fin truncated." 



" Body sub-cylindric, elevated at the nape ; head quadrangular, gibbous above the eye, almost 

 as high as long ; the rays of the anal fin are very strong and large ; scales rhomboidal, equal ; 

 body of a beautiful orange colour, which is deepest on the back, the base of the scales dark 

 red ; the sides are heightened with golden reflections ; pectoral, ventral, and anal fins of a fine 

 red orange, caudal fin of a deep carmine colour- — the dorsal is paler than the rest of the fins ; 

 the lateral line is nearly straight, and commences on a level with the eye. Length of indi- 

 vidual described sixteen inches : its depth three, and its thickness two inches and a half. 



« Fins.— P. 18; D. 14; V. 9; A. 8 ; C. 18." (Le Sueur, I. c.) 



