MUSEUM OF COMPARATIVE ZOOLOGY. 6 



water specie?, recognized tlic two genera. It may be that DeKay did not 

 have the Cottus gobio in view when he proposed the name of Uranirfea, but 

 his U. quiescens is the American representative of the Cottus gobio of Eu- 

 rope ; and therefore, as he was the first to distinguish the two genera 

 in lu. led under the name of Cottus, his name should be retained for the 

 fluviatile species, and that of Coitus for the marine, called by Girard Acan- 

 ilwcottus. If the principle adopted by Girard were followed, it would 

 involve the change of such a large number of generic names as to create 

 the greatest confusion in nomenclature. 



Catonotus lineolatus Agassiz, Am. Journ. Sei. Arts, (2') XVII. p. 304. 

 1854. 



Catonotus flabellatus Putxam, MS. i860. 



Syx. Elheosloma flabdlalum Rafixesque, Ichth. Ohien. p. 30, 1820; 

 Eljieosloma Linsleyi II. R. Stoker, 1851 ; Oligocephalus Jnimeralis Gikard, 

 1859; Oligocephalus Linsleyi Girard, 1859; Catonotus fasciatus Girard, 



1809. 



Catonotus Kennicotti Pctxam, MS. i860. (Nov. sp.) 



We have dedicated this species to Mr. It. Kennicott. who has collected a 

 number of fine specimens in "a rocky brook in Southern Illinois." It is 

 closely allied to C. lineolatus Agassiz, but the scales are larger, and there 

 arc no distinct longitudinal stripes as in that species. The males have the 

 scales of the upper portion of the tail spotted ; the first dorsal fin is 

 black, with a white base ; the second dorsal, black, with spots of white upon 

 the rays. Females, of a light brown color, with mottlings of a darker 

 shade ; no transverse bars, as in the females of the other species of the 

 genus ; with eggs in April and May. 



Nothonotus Agassiz, MS. 1SG0. (Nov. gen.) 



This genus differs from Catonotus l>y having the body more compressed, 

 by the smaller and more numerous scales, and by the longer and higher 

 first dorsal fin. Nothonolus maculatus Agassiz, MS. (Ethcosloma macula- 

 tuw Kirtlaxd) and the following species are the only known representa- 

 tives of the genus. 



Notlionotus punctulatus Agassiz, MS. i860. 



Syx. Pcecilichthys punctulatus Agassiz, Am. Journ. Sei. Arts, (2°) 

 XVII. p. 301, 1S54 ; Pacilichthjs mirab'dis Girard, MS. 1859; Boleichtltys 

 Wfiipplei Girard, 18.39. 



Poeoilichthys cceruleus Agassiz, MS. i860. 



Syx. Etheostoma cvcruleum Storer, Proc. P>ost. Soc. X. IT. II. p. 47, 

 1845; Pcecilosoma erytJirogastrum Kirtlaxd, 1854 ; Pcecilichthys erythro- 

 gastcr Agassiz, 1854 ; Pozcilichtliys versicolor Agassiz, 1S5-1 ; Pileoma cy- 

 malogramma Arbott, lsGO. 



