6 University of Michigan 



pectoral rays, another but one ray, branched on each side ; the 

 other five specimens of the same lot have all the rays simple. 

 This occasional branching of the pectoral rays is not confined 

 to this species however, for a large example of Coitus nicridion- 

 alis from Joliet, Illinois, has some pectoral rays branched, 

 three on one side, one on the other. 



In comparing Lake Superior and Cayuga Lake material, cer- 

 tain average differences were noted. In the Lake Superior 

 specimens the vertical of the greatest depth usually passes be- 

 fore rather than behind the origin of the first dorsal; the fins 

 are a little shorter, the eye a little larger, and the caudal ped- 

 uncle usually slenderer. These differences, however, are far 

 from constant, and are probably to be regarded as racial rather 

 than specific or even subspecific. Should the Lake Superior 

 race be found on further study to be worthy of specific or 

 subspecific denomination, it must receive a new name, as Cotttis 

 richardsonii Agassiz is preoccupied. 



Variation in Number of Anal Rays in Cottiis bairdii 



Locality 



II 

 Sauk Ste. JMarie and Lizard Islands, Lake 



Superior — 



Cayuga Lake, New York i 



Cottiis gracilis Heckel 



Uranidca gracilis Jordan and Evermann, Bull. U. S. Nat. INIus., 47, 

 pt. 2, 1898, p. 1968 (with synonomy). 



Cottns gracilis Kendall, Bull. U. S. Fish Comm., 22, 1902 (1904), 

 p. 362. 



Cotttis richardsonii Gill, Smiths. jMisc. Coll., 52, 1908, p. 114 (in 

 part). • 



A single specimen of this species is at hand from Michigan, 

 a locality far west of any previously recorded for the species. 

 It was collected in Little Manistee Creek, tributary to Lake 

 Michigan, by Gen. John McNulta, in July, 1899. It agrees 



