Cottus cognatus, &c. with Cottus gobio. 117 
ka 
distinct species ; he did so, applying the specific name cogna: 
tus. His account is very full and complete, and leaves us in 
no doubt in attempting to determine his species. 
In 1837? Mr. Haldeman published, in a small pamphlet, a 
brief notice of a Cottus, which he supposed to be new, and 
which he named viscosus. From his description, we could 
searcely identify the fish, but fortunately we have other means 
of information. 
In 1843, Dr. De Kay’s Report on the Fishes of New York; 
appeared. In the northern part of the State he had found a 
fish, which he supposed to be undescribed, and for which he 
felt compelled to institute a new genus. He called the genus 
Uranidea, from the position of the eyes ; the species he named 
quiescens. His description is by no means precise, and his 
figure is not accurately drawn; but, as in the case of the 
viscosus, we are able from other sources to decide with cer- 
tainty, in regard to the species intended by him. 
July 5, 1842, Mr. C. H. Olmsted brought to me two spe- 
cimens of Cottus, which had been taken in asmall stream, in 
Manchester, Ct. On examination, although I found that they 
agreed in all respects with Dr. Richardson's description, and 
Were evidently his C. cognatus, I was unable to see in what 
they differed from the Cottus gobio. In this Mr. Olmsted 
coincided with me; indeed, the opinion was first suggested 
by him. We visited the place where they were obtained, 
and found the species very abundant. I have since taken 
these fish, at different seasons of the year, of different sizes, 
and of both sexes; I have examined them closely, with the 
help of all the descriptions to which I could obtain access; - 
Thave tried them by their internal anatomy, and by their 
external appearance, and I cannot come to any other conclu- 
“on, than that they are identical with the Miller’s Thumb, or 
River Bullhead, which is found so abundantly in the streams 
! hout many parts of Europe. ^ ^ — mr : 
We know, from unquestionable testimony, that the species 
of Mr. Haldeman and Dr. De Kay are identical with the one 
& 
