86 
U. S. P. R. R. EXP. AND SURVEYS—ROUTE TO CALIFORNIA. 
17. GASTEEOSTEUS WILLIAMSONI, Grd. 
Gen. Eep. 93. 
Spec Char. —Body smooth all over; peduncle of tail not keeled. Dorsal spines three, exiguous and slender and not serrated ; 
insertion of anterior one situated above the base of the pectorals. Insertion of ventrals slightly in advance of the second dorsal 
spine, their own spines are serrated upon both edges, and their extremities do not reach the tips of the ossa innominata. Posterior 
margin of caudal fin sub-crescentic. 
340. Williamson's Pass, California. Dr. A. L. Heermann. 
18. ATHEEINOPSIS CALIFOENIENSIS, Grd .—California “ Smelt.” 
Gen. Eep. 103. Plate XXII c. 
Spec Char. —Head small and sub-quadrangularly pyramidal, constituting the sixth of the entire length. Base of anal fin 
much longer than that of the second dorsal. Greyish brown above; light brown or silvery beneath. Fins olivaceous, unicolor. 
351. San Francisco, California. Dr. A. L. Heermann. 
19. GOBIUS LEPIDUS, Grd. 
Gen. Eep. 127. Plate XXXVa, Figs. 5—6. 
Spec. Char. —Body elongated, slender, and very compressed. Head sub-conical; jaws equal; gape of mouth oblique ; posterior 
xtremity of maxillary extending to a vertical line drawn back of the pupil. Interocular space narrow. Reddish brown; fins 
blackish. 
361. San Francisco, California. Dr. A. L. Heermann. 
20. MOEEHUA PEOXIMA, Grd. 
Gen. Eep. 142. Plate XLa, Figs 5 — 8. 
Spec. Char —Snout sub-conical; thickish; upper jaw protruding beyond the lower one. Posterior extremity of maxillar 
bone extending to a vertical line which would intersect the pupil Dorsal and anal fins all distinct from one another. Anterior 
anal longer than the second dorsal. Caudal fin posteriorly sub-truncated. Yellowish ash or brown above; sides and belly 
silvery white. 
525. San Francisco, California. Dr. A. L. Heermann. 
21. PLATICHTHYS EUGOSUS, Grd. 
Gen. Eep. 148. 
Spec. Char. —Eyes moderate, situated on the left side. Interocular space moderate. Peduncle of tail long. Origin of 
dorsal fin corresponding to a vertical line intersecting the middle of the pupil. Scales very rugose and plate-like. Lateral line 
slightly arched above the pectoral fins. Left side dark reddish brown; fins olivaceous, dorsal and anal with alternate vertical 
bands of black, caudal with longitudinal bands of the same hue. Ventrals and pectorals unicolor. Right side dull yellow. 
695. San Francisco, California. Dr. A. L. Heermann. 
22. PLEUEONICHTHYS COENOSUS, Grd. 
Gen. Eep. 151. 
Spec. Char. —Body sub-elliptical. Posterior extremity of maxillary extending to a vertical line drawn midway between the 
pupil and the anterior rim of the orbit. Origin of dorsal fin curved towards the left side of the head, and corresponding to the 
anterior rim of the upper orbit on the right side. Ground color olivaceous brown, maculated. 
697. San Francisco, California. Dr. A. L. Heermann. 
