16 THE FISHES OF 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 larve were taken froma 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 gin 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. olor 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 
ripples 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 
in the State University collection. The Ammocetes 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. 
