80 



MONOGRAPH OF THE FRESH WATER COTTOIDS, ETC 



III. 



§ 4. Species with three soft rays to the ventrals 

 VII. Cottus gracilis 

 VIII. Cottus viscosus 

 IX. Cottus Franklinii 

 X. Cottus gobioides 

 XI. Cottus holeoides 

 XII. Cottus formosus 

 XIII. Cottus Fabricii 



PAGE 



49 

 49 

 51 

 53 

 55 

 56 

 58 

 59 



CHAPTER IV. 



ON THE GENUS COTTOPSIS, Girard. 



Cottopsis asper 



CHAPTER V. 



ON THE GENUS TRIGLOPSIS, Girard. 



Triglopsis Thompsonii 

 Note .... 

 Diagnosis of the genera and species 

 Bibliography 

 Explanation of the plates 

 Alphabetic register of systematic names alluded to in this monograph 

 Contents ....■■• 



65 

 68 

 69 



72 

 75 

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 79 



PUBLISHED BY THE SMITHSONIAN INSTITUTION, 

 WASHINGTON CITY, 



DECEMEEE, 1851. 



