264 PROCEEDINGS OF THE ACADEMY OP 



six spots formed by aggregations of dark dots on the ridge of the back, between 

 the second dorsal spine and the axil of the soft dorsal fin; the first spot below 

 the interval between the second and third spines ; the second below that, be- 

 tween the fifth and sixth ; the third between the dorsals ; the fourth below the 

 fourth ray; the fifth below the seventh, and the sixth below or behind the 

 tenth or last. Another row of similar but fainter spots runs from the scapular 

 region, and a third row along the middle of the sides on every third or fourth 

 scale, while at the base of the caudal there is a spot above and another below 

 the middle. The humeral region is bluish. The head is tawny, with three 

 dark spots between the forehead and dorsal ; a larger above the operculum, 

 surmounted above by a blue dot ; three blue dots below the oculo-scapular 

 groove, the first two nearest and behind the eye, the third on the operculum. 

 A straight blue line crosses the cheek above and slightly upwards, and is con- 

 tinued, after interruption, on the operculum ; above and below it are dark dots, 

 especially closely aggregated below, behind the angle of the mouth. The dor- 

 sal fins have a few faint blue spots. 



A single specimen of this species, one inch and seven-tenths long, was ob- 

 tained by Dr. Kennedy, the naturalist of the northwest Boundary Commission, 

 in Washington Territory. 



Genus EUCYCLOGOBIUS Gill. 



Synonymy. 

 Eucyclogobius Gill, Proc. Academy of Natural Sciences of Phila., 1862, p. 279. 

 Gobius (Gd.) sp. Girard. 

 Lepidogobius sp. Gill. 

 Cyclogobius sp. Steindachner. 

 Gobius (L.) sp. Gilnther. 



Body robust, subfusiform, compressed towards the caudal fin, with the anus 

 scarcely in advance of the middle ; behind very slowly decreasing in height 

 towards the caudal peduncle, which is oblong, and not, or scarcely, contracted 

 at its middle. 



Scales regularly imbricated, small, cycloid, ovoid, with the nucleus behind 

 the centre, with numerous radiating stripe diverging towards the front and 

 sides, and with concentric striae or wrinkles behind. The scales advance for- 

 wards nearly or quite as far as the nape. 



Head scaleless, oblong, conoid, subquadrangular behind, and nearly as wide 

 as high, above transversely convex in front of the nape and on the sides. 

 Opercula compressed ; cheeks scarcely tumid ; snout oblique; eyes moderate, 

 longitudinal elliptical, nearly lateral, rather distant from each other, and situ- 

 ated nearly in the middle of the anterior half of the head. Opercula unarmed ; 

 operculum well developed, nearly as long as the interval between it and the 



eye. 



Mouth with the cleft oblique, longitudinal, the periphery of each jaw ovoid, 

 the supramaxillars extending beneath the eye. Lower jaw nearly even with 

 or scarcely projecting beyond the upper. Intermaxillars slightly protractile 

 downwards, with the posterior processes short and wide, and with the lateral 

 branches thick and attenuated towards the ends, but with a thin crest above 

 (behind), along the posterior half. Supramaxillars nearly twice as long 

 as the intermaxillars, with a compound apophysis in front, thence nearly 

 reetilinear, but twisted, narrow, and only slightly dilated below towards the 

 ends. 



Tongue thick, emarginated in front, and free. 



Teeth curved conic, pluriserial ; those of the outer row of the upper jaw 

 enlarged. 



Branchial apertures lateral, nearly vertical, bounded above by a membrane 

 attached in front of the axil of the pectoral fin ; below continued forwards in 

 a slit between the fourth ray and the breast. 



[Sept. 



