ltJ6 TRIOriDJf. 



17. Cottus polyacanthocephalus. 



Palhs, Zoogr. p. 133. pi. 23 ; Cm. &,- Val. iv. p. 177. 

 D. 10 I 15. A. 12. 



Crown mth four groups of pointed granulations ; a similar group 

 above the temporal region ; three^prfcopercular spines, two of which, 

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

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

 fins with, irregular bands. 



N.W. coast of America. 



18. Cottus quadricomis. 



Cottus, ."sp. 2, ArtecU, Gene) a, p. 43, and Sjjec. p. 84 j Gronov. Zoophyl. 



no. 272. 

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



Larep. iii. p. 241 ; Chi\ e^ Val. iv. p. 168 ; Ekstrom, Fische Morko, 



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



Wliifc, Coted. Brit. Fishes, p. 7; Gronov. Syst. eel Gray, p. 102; 



P PuU. Spieil. Zool. viii. p. 25 (not Parry). 



D. 9 I 14. A. 13-15. Ciec. pylor. 7. Vert. 40. 



Two small spines above the snout ; four very prominent and rough 

 tubercles on the crown, the quadrangular space between them rather 

 longer tlian broad ; foiu- pra^operciilar spines, the uppermost of 

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

 The height of the first 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. 



o. Adult. London market. Presented by Dr. J". E. Gray. 

 h, c. Adult. From the Haslar CoUectio.:. 



19. Cottus hexacornis. 



Richards. Franklin Jonrn. p. 72<'>, and Faun. Bor. Amer. Fishes, p. 44. 

 D. 7 1 13. A.—? 

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

 their .summits fiattish 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 hinrndo. 



Leiocottus hirundo, Girard, Pror. Ae. Nat. Sc. Phijad. 1856, p. 133, 

 and U. S. Pacif. R. R. Exped. Fishes, \>. 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. (jUll-oprnings con- 



