33. CENTRIDERMICHTHTS. 169 



orbits is very slightly condave, very narrow, its width being nearly 

 one-third the distance between the upper posterior angles of the 

 orbits. The crown is flat, without any longitudinal or transverse 

 ridges, but with a very slight impression in the middle. The 

 frontal bones, the praeoperculum, the mandibula, and the infra- 

 orbitals have very distinct muciferous channels ; the turbinals are 

 provided with a minute spine. The number of the caudal vertebrae 

 is increased, there being twelve in the abdominal portion and twenty- 

 eight in the caudal. 



26. Cottus diceraus. 



Cottus diceraus, Pall. Nov. Act. Petrop. 1783, p. 354. pi. 10. f. 7 ; Cuv. 

 (§• Val. iv. p. 189 ; Cuv. E^gne Anim. III. Poiss. pi. 21. f. 1 ; Beech. 

 Voy. Zool. Fishes, p. 57. pi. 15. f. 2. 



stelleri, Bl. Sclm. p. 0:}. 



Synanceia cervus, Tiles. Mem. Acr.d. St. Petersb. iii. p. 278. pi. 13. 

 Ceratocottus * diceraus, Gill, Proc. Acad. Nat. Sc. Philad. 1859, p. 165. 

 D. 7 I 14-15. A. 10. 

 Two spines above the snout. The superciHaiy margin elevated 

 and continued into a ridge, which terminates posteriorly in a tren- 

 chant point. Praeoperculum with four spines, two of which are at 

 the angle ; the upper very long, equal to two-thirds the length of 

 the head, and armed with eight recurved teeth ; suboperculum with 

 two spines. Lateral line with roiigh tubercles. 

 Coast of Kamtschatka. 



33. CENTRIDERMICHTHYS. 



Trachidermust, Meckel, Ann. Wien. Mtis. 1840, ii. p. 159. 

 Centridennichthys, Richards. Voij. Sidph. Fishes, p. 73. 

 Cottopsis, Oligocottus, et Leptocottus, Girard in U, S. Pacif, R. R. 

 Exped. Fishes, p. 51, &c. 



Head more or less depressed, rounded anteriorly ; body subcyUn- 

 drical, compressed posteriorly ; head and body covered with soft and 

 scaleless skin, more or less studded with prickles or granulations ; 

 lateral line present. Two dorsals, of moderate height ; pectorals 

 rounded, with some or all the rays simple ; ventrals thdracic, of 

 moderate length. TeetJi in the jaws, on the vomer and palatine hones. 

 Air-bladder none ; pyloric appendages in moderate number. 



Coasts of Japan and China ; Pacific coasts of North America ; fresh 

 waters of California and of the Oregon and Washington Territories ; 

 coast of Greenland. 



1. Centridermichthys fasciatus. 



Trachidermus fasciatus, Heckel, Ann. Wien. Mus. ii. 1840, p. 160. 



taf. 9. f. 1, 2. 

 Centridermichthvs ansatus, Richards. Voy. Sulph. Fishes, p. 74. pi. 54. 



f 6-10. 



* Preoccupied by Phobetor. 



t Trachidcrnms is inadmissible; the correct form, Trachydcrmu, was pro- 

 occupied long ago by Latrcillc for a genus of Insects. 



