262 PROCEEDINGS OP THE ACADEMY OP 



Branchiostegal rays six. 



Dorsal and anal fins confluent with, the caudal, and uninterrupted. 



Pectoral fins fan-shaped, rather small, and inserted rather low. 



Ventral fins obsolete. 



The Ophidium imberbe of Linn., as understood by recent authors, and the 

 0. stigma of Lay and Bennett, do not belong to this genus. The latter is dis- 

 tinguished by its scaly body. 



Gymnelis viridis Reinhardt. 

 Synonomy . 



Ophidium viride Fabricus, Fauna Groenlandica, p. 141. Block, Schneid., p. 

 486. Ross, Reinhardt. 



Ophidium unernak Lacepi.de, Histoire Naturelle des Poissons, tome ii. p. 286. 



Gymnelis viridis Reinhardt, Kongelige Danske Videnskabernes Selskabs Nat. 

 og Mat. Afhandlingar, deel vii. Kroyer, Voyage en Scandinavie, en 

 Laponie, au Spitzberg et aux Faroe, &c, sur la corvette "La Re- 

 cherche," Poissons, tab. 15. Richardson, Last of the Arctic Voyages, 

 p. 371, pi. 30. Kroyer, Naturhistorisk Tidsskrift Stiftet af Henrik 

 Kroyer, udgivet af Prof. J. C. Schiodte, naepes iii. hafte 2, 1862. (Jiin- 

 ther, Catalogue of the Fishes in the British Museum, vol. iv. p. 323. 



Cepolophis viridis Kaup, Archiv fiir Naturgeschichte. 

 Hab. Greenland. 



Descriptions of the GOBIOID genera of the Western coast of Temperate North 



America. 



BY THEODORE GILL. 



In the present article, detailed descriptions are submitted of three genera 

 represented on the coasts of the Pacific United States. Although more than 

 usually detailed, it is believed that no characters except such as are strictly 

 generic are included ; the brief references made to other genera will assist in 

 obtaining an idea of the character of variation in the family. After having 

 seen as numerous species as any of my predecessors, I am convinced that many 

 natural genera are included under the name Gobius. A number of these have 

 already been name!, but others yet remain without designation. 



The subfamily Gobiinas is the only one so far known to be represented in the 

 Californian and Oregon waters. Further south, the subfamilies Eleotrina?,^Si- 

 cydiinav* and Amblyopinae occur. 



Genus CORYPHOPTERUS Gill. 



Synonymy. 

 Gobius sp. auct. 



Body robust, considerably compressed, especially towards the back and cau- 

 dal fin, with the anus considerably in advance of the middle ; caudal peduncle 

 oblong, high, and not contracted. 



Scales regularly imbricated, large, more or less hexagonal, with the posterior 

 margin pectinated, the nucleus at or near the posterior angle, and with striae 

 radiating thence towards the anterior margin ; the scales cease near the nape. 



Head scaleless, oblong, above nearly square and transversely arched behind 

 the eyes ; the sides compressed downwards ; cheek scarcely tumid ; snout 

 oblique ; eyes rather large, longitudinally elliptical, oblique, very closely ap- 

 proximated, and situated chiefly or wholly in the anterior half of the head ; 



* The Sicydiinae are represented by four genera, Sicydium, (old world), Sicyopterus (new 

 world), Sicyupus (without labial teeth, &c, and embracing Sicydium zosterophorum, Blkr., and 

 S. bait nense Blkr.), and Sicyogoster Gill, (neo BarneTille = Gobicsoz. 



[Sept. 



