ZooL.— Vol. III.] GILBERT— PACIFIC COAST FISHES. 263 



The pectorals are long, reaching to below the middle of the spinous dorsal, 

 the lower rays slender, but produced and exserted. The ventrals are long 

 in the type specimen, reaching halfway to the origin of the anal fin (from g^ 

 to \ this distance in alascanus and pentacanthus). 



The color is light olivaceous, with faint traces of lighter bars; under parts 

 white. The ventrals are white, the other fins faintly dusky, not with con- 

 spicuous black areas as in pentacanthus. 



A second specimen, 49 mm. long, was taken at the same 

 locality. The fin rays are : Dorsal VI-6; anal 7; pectoral 



15- 



The species is most nearly related to X. alascanus, but is 



in some respects intermediate between that species and X. 

 pentacanthus. From -pentacanthus it differs in the deeper 

 wider interorbital groove, the higher and stronger ridges 

 and spines on the head, the deeper occipital depression, the 

 heavy coalesced plates on the cheek below the suborbital 

 ridge, the presence of but one pair of pre-ventral plates 

 (the rest of the median series being unpaired), and the 

 greater width of the pre-ventral area, the plates of which 

 are thick, very finely granular, and without spines. From 

 alascanus it differs in the narrower head and body, the 

 weaker development of spines and ridges on the sides of 

 the head, and the longer ventral fins. It differs conspicu- 

 ously also in the strong spines of the lower lateral plates, 

 those in alascanus being weak or obsolescent, especially on 

 the caudal peduncle. 



From both species it differs in the more posterior anal 

 opening, which is on the third instead of the second plate 

 behind the base of the ventral fins. It has also a narrow 

 but easily appreciable free fold along the posterior margin 

 of the gill membranes near the median line; the lower 

 margin of the preorbital is spinous. 



5. Clevelandia ios Jordan & Gilbert. 



Gobiosoma ios Jordan & Gilbert, Proc. U. S. Nat. Mus. v. 5, 1882, p, 437; 



Saanich Arm, Vancouver Island. Jordan & Gilbert, Synop. Fish. 



N. A. 1883, p. 948. Jordan & Eigenmann, Proc. U. S. Nat. Mus. 



V. 9, 1886, pp. 507, 509, 516, 517. 

 Clevelandia ios Jordan & Starks, Proc. Calif. Acad. Sci. 2d ser. v. 5, 1895, p. 



839, pi. c. Jordan & Evermann, Fish. N. and M, Amer. pt. 3, 1898, 



p. 2254. 



