i6 the; fishes op ohio. 



more than a year. One large larva, seven inches in length, 

 showed the following colors : dull yellow, pigmented above with 

 fine, brown specks, giving to the back a brownish cast ; this is 

 interrupted in the mid-dorsal line, leaving a . yellow, vertebral 

 line ; fins yellowish, brightest at base. Young larvae, two and 

 one-half inches long, were light olive brown, with fine brown 

 specks above ; dark around base of anal fin. Eyes very slightly 

 developed. The young larvae were taken from a mass of sand 

 and mud seined from the bottom of Sawmill Run. 



The species was first taken by Dr. Kirtland in Big Miami 

 river, and described by him. He afterward recorded it from the 

 Mahoning and Scioto rivers. Vermillion river, McCormick, 1892 ; 

 Big Jelloway creek, Parker, Williamson and Osburn, 1898 ; Hen- 

 shall mentions one which passed through a hydrant in Cincinnati ; 

 and Dr. Jordan says, "I have obtained several specimens with 

 Perch from Lake Erie, both external, feeding on the Perch, and 

 Internal, having been devoured by the fish." 



Genus: Lampetra.. 



Lampetra wilderi (Gage). Small Black Lamprey; 

 Brook Lamprey. 

 Sucking disk smaller than in the preceding, the fringes longer. Dorsal 

 'fin arising midway from snout to end of tail, not continuous with caudal 

 except during breeding season, when it is deeply notched. Below the mouth 

 is a transverse row of blunt, horny teeth, 5 to 9 in number. On each side 

 of the disk is a plate with three bicuspid teeth ; supraoral plate with a - 

 tooth at either end ; remaining teeth few and weak. About 65 muscular 

 grooves between gills and vent. Color bluish black, lighter on disk and 

 "belly. Length 6 to 9 inches. 



Although from its range we might expect this species to occur 

 throughout the state, it has, I believe, been recorded for but one 

 locality. Mr. J. B. Parker has observed it to be common on the 

 Tipples of small tributaries of Big Jelloway creek, in Knox 

 County, about the middle of April. Four specimens were cap- 

 tured at one dip of an insect net, and specimens taken by him are 

 rin the State University collection. The Ammocoetes bicolor, or 

 Blind Lamprey, which Kirtland records from the Mahoning river 

 may have been the larva of either this or the preceding species, 

 -as the immature forms are so similar as to be almost indistin- 

 guishable. 



