166 TRIGLID^. 



17. Cottus polyacanthocephalus. 

 Pallas, Zoogr. p. 133. pi. 23 ; Cuv. 8( Val. iv. p. 177. 

 D. lU I 15. A. 12. 



Crown -vvith four groups of pointed granulations ; a similar group 

 above the temporal region ; three prseopercular spines, two of which 

 are at the angle, the upper one extending nearly as far backwards as 

 that of the operculum. Skin naked. Brownish, with lighter spots ; 

 fins with iiTegular bands. 



N.W. coast of America. 



18. Cottus quadricornis. 



Cottus, sp. 2, Artedi, Genera, p. 48, and Spec. p. 84 ; Gronov. Zoophyl. 

 no. 272. 



Cottus quadricornis, L. Syst. i. 5. 451 ; Bl. t. 108; Bl. Schn. p. 62 

 Lacep. iii. p. 241 ; Cuv. S( Val. iv. p. 168 ; Ekstrom, Fische 3Iorkd^ 

 p. 178 ; Fries och Ekstr. p. 30. t. 7. f. 1 ; Yarr. Brit. Fishes, i. p. 83 

 White, Cntal. Brit. Fishes, p. 7 ; Gro)iov. Syst. ed. Gray, p. 102 

 P Pall. Spicil. Zool. viii. p. 25 (not Parry). 



D. 9 I 14. A. 13-15. Ctec. pylor. 7. Yert. 40. 



Two small spines above the snout ; foiu* very prominent and rough 

 tubercles on the crown, the quadi'angular space between them rather 

 longer than broad ; foui' praeopercular spines, the uppermost of 

 which is the longest, and about equal to the diameter of the eye. 

 The height of the fii'st dorsal is much less than the length of the 

 maxillary bone. The ventral terminates at a great distance from the 

 vent, whilst the pectoral extends nearly to it. One or more series of 

 granular tubercles, parallel to the lateral line. Greyish ; fins some- 

 times spotted. 



British Channel ; German Ocean; Baltic. 



a. Adult. London market. Presented by Dr. J. E. Gray. 

 h, c. Adult. From the Haslar Collection. 



19. Cottus hexacornis. 



Richards, Franklin Journ. p. 726, and Faun. Bor. Amer. Fishes, p. 44. 

 D. 7 I 13. A.—? 

 Six club-shaped processes stand erect on the top of the head, 

 their summits flattish and scabrous ; the smallest pair are situated 

 between the nares. Fins streaked with bluish-black. (Rich.) 

 Mouth of Tree River, near the Coppermine, lat. 67° 12' N. 



20. Cottus hirundo. 



Leiocottus hirundo, Girard, Proc. Ac. Nat. Sc. Philad. 1856, p. 133, 

 and U. S. Pacif. P. P. Exped. Fishes, p. 62. pi. 16. f. 2, 3. 



B. 5. D. 9 I 17. A. 17. V. 1/3. 

 Posterior extremity of the maxillary with two or three small 

 thread-like barbels. Skin perfectly smooth. Gill-openings con- 



