Jordan and ILvert?iann. — Fishes of JVorth Anurica. 195 



same over the whole body ; the vertical height of their uncovered portion 

 considerably exceeds its length. A linear inch measured longitudinally 

 on the sides includes 3 scales, but vertically only 2. There are 47 scales 

 on the lateral line, and about 10 in a vertical lino under the dorsal. A 

 scale detached from near the lateral line above the ventals measures 8J 

 lines in length, and 7^ in width. The lateral lino turns up decidedly at 

 the anal as in C. hitdvonius {Catostomus catofitomus). 



" Form more compressed than in the preceding species, {forNteriatiun). 

 Profile oblong, having the greatest height (which is about i of the total 

 length, including the caudal) at the begiuning of the dorsal. The head 

 is smaller than in either of the preceding species, forming scarcely ^ of 

 the total length. The very small mouth is farther back than in C /twrf- 

 sonius, being, when the jaws are retracted, an inch behind the tip of the 

 rather narrow snout, and just even with it when they are protruded. The 

 lips, instead of being papillated, are furrowed vertically in a very regular 

 and beautiful manner. The palate and gullet resemble the same parts in 

 C. hudsonius, but are smaller, the comminuting apparatus being more deli- 

 cate, and the oesophagus remarkably contracted at its origin. 



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



" The dorsal fin is larger than in the foregoing 2 species, and is nearly 

 in the middle of the fish. The pectorals measure rather less than i of the 

 distance between the gill openings and caudal fin. The ventrals are 

 under the middle of the dorsal. The tip of the anal, wheu turned back, 

 rather overlaps the base of the caudal; its last ray is A-ery 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 4 

 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 intestines has the same minute longitudinal rugje as that of the pre- 

 ceding 2 species. The air bladder is divided into 3 portions, the central 

 one being the largest, and communicating with the oisophagus. The 

 upper one alone has a thick shining capsule. 



"This handsome species was observed by us only in Pine Island Lake, 

 lat. 54°, long. 110° ; but it is not unknown in other parts of the fur 

 countries, though much more rare than the 2 preceding species." 



Elsewhere (p. 303), Richardson gives measurements of a specimen 

 from Albany River. From these we take the following, reducing the dimen- 

 sions to proportions of the length : Total length 19^ inches. Head 5^ in 

 length; eye 4J in head; caudal lobes li times length of head; caudal fork 

 If in head. Height of dorsal equal to length of head. (Named for 

 Charles A. Le Sueur, artist and naturalist, the first to study the fishes of 

 the Great Lakes and author of the first review of the Catontomida;.) 



(S»to»<om«ji /esMt'Hrii, RiCHAUDSoN, Fniiiklin's Journal, 182:i, 772, Pine Island Lake, British 



America. 

 Oyprinus {Caloslomus) sneHrii, RiCHAUDSON, Fauna Bor. Am., ill, 183G, ll'J, 303. 



