80 MONOGRAPH OF THE FRESH WATER COTTOIDS, ETC. 
§ 4. Species with three soft rays to the ventrals . 
VIL. Cottus gracilis 
VIII. Cottus viscosus 
IX. Cottus Franklinii 
X. Cottus gobioides 
XI. Cottus boleoides 
XIL. Cottus formosus 
XIII. Cottus Fabricti 
CHAPTER IV. 
ON THE GENUS Corropsts, Girard. 
Cottopsis asper 
CHAPTER V. 
ON THE GENUS TRIGLOPSIS, Girard. 
Triglopsis Thompsonii 
Note : 
Diagnosis of thexg genera aad species 
Bibliography 
Explanation of the late . 
Alphabetic register of systematic names alluded to in fins monograph 
Contents 
PUBLISHED BY THE SMITHSONIAN INSTITUTION, 
WASHINGTON CITY, 
DECEMBER, 1851, 
III. 
PAGE 
49 
49 
ol 
53 
ay) 
56 
58 
D9 
