Jordan and Evermann. Fishes of North America. 1941 



backward toward the nape, the occipital ridges sharp behind; upper pre- 

 opercular spine very long, rough, nearly as long as head, with strong 

 recurved hooks or serrations on the upper edge; lower preopercular spines 

 strong; opercle with a longitudinal rib and no distinct spine; lateral line 

 with a row of rough bony scutella, each with a minute central spine; 

 skin above more or less villous or prickly, elsewhere smooth. Isthmus 

 wide; a slit behind last gill; vomer with teeth. Bering Sea, rather com- 

 mon from Alaska to Kamchatka and Saghalin. Here described from a 

 specimen in the British Museum, about 6 inches long. 



Dr. Gilbert has this note on several adults taken with seine at Heren- 

 deen Bay, Alaska Peninsula: 



There are 6 or 7 strong barbs inclined forward on upper surface of pre- 

 opercular spine, which is very long, slender, and straight, reaching to below 

 middle of spiuous dorsal. Filaments arranged as in Enophrys clarigcr, 

 but those on posterior part of body much more numerous. Anal papilla 

 very large, 0.27 mm. in a specimen 195 mm. long. There seems to be no 

 prickles on region above lateral line, or 011 abdomen. Stomachs tilled with 

 molluscan shells, mainly limpets. D. VIII. 13 or 14; A. 10 to 12. 



One specimen from Robbeii Island, collected by Mr. Barrett-Hamilton, 

 and 3 young specimens from Petropaulski, show the folio wing characters: 

 The depth of the occipital depression, the height of the different ridges 

 and spines, and the amount of the irregularity in the cusps of the pre- 

 opercular spine is subject to great individual variation. We find no 

 important differences between this specimen and those from the Alaskan 

 Peninsula reported on by Gilbert (Report Commissioner of Fish and Fish- 

 eries, 1896, 426). The occipital depression is less and the cross ridge behind 

 it much lower in the adult from Robben Island, the occiput comparatively 

 flat and without cross ridge in the young. We do not venture to base any 

 distinctions on these differences which may be due in part to age and in 

 part to individual variation. (81$, two; nepaos, horned.) 



Cottus diceraus, PALLAS, Nov. Act. Petropol. 1783, 354, pi. 10, tig. 7, Petropaulski, Kam- 

 chatka (Coll. Steller); CuviER <fc VALENCIENNES, Hist. Nat. Poiss., iv, 189, 1829; 

 GUNTHER, Cat., n, 189. 



Synauceia cervux, TILESIUS, Mem. Ac.Pertersb., in, 1811, 278, pi. 13, Petropaulski. (Coll. 

 Steller.) 



Cottus stelleri, BLOCK & SCHNEIDER, Syst. Icbth., 63, 1801; after STELLER. 



Ceratocottus diceraus, GILL, Proe. Ac. Nat. Sci. Phila. 1859, 165, and 1861, 167. 



Enophrys diceraus, JORDAN & GILBERT, Synopsis, 711, 1883; GILBERT, Kept. U. S. Fish 

 Coium. 1893 (1896), 426. 



729. COTTUS (Artedi) Linnams. 

 (MILLER'S THUMBS.) 



Catties, ARTEDI, Genera Piscium, 49, 1738. 

 Cottus, LINNJEUS, Syst. Nat., X. 264, 1758 (gobio *). 

 Pegedictis, RAFINESQUE, Ichth. Ohiensis, 85, 1820 (ictalops). 



* Cottus gobio, the common Miller's Thumb of Europe, belongs to the same group as 

 Cottus pollicaris, philonips, etc., having no palatine teeth, the skin smooth, and the ventral 

 rays 1, 4. The rays are D. VI to VIII, 16 or 17; A. 12. The name Cottus is restricted to 

 this type by Cuvier & Valenciennes, who remark, " Ce genre (Cottus) avait pour type 

 primitive, u'n petit acanthopterygien de nos rivieres a tete large," etc. 



