The fishes described in the following articles were collected by me for the State Geological Survey, along the Southern Coast of this State and among the adjoining islands. While it is possible that some of them may have been described in works not now accessible to us, the probabilities are entirely in favor of their being new, as we have very recent lists of all the species described as inhabitants of this Coast since the report on fishes collected by the Pacific Rail Road Surveys. For much information and assistance in their determination, I am indebted to Dr. W. O. Ayres, and also to Dr. George Hewston, for the use of books not contained in any public library in the city. The outline illustrations, reduced from accurate measurements, were electrotyped and presented by our industrious collaborator, Dr. Kellogg. The colors described are in all cases those of the living fish. DEKAYA, n. g.[6] _Generic characters._—General shape elongated and fusiform, head small and short, premaxillaries slightly protractile, eye large, situated above the level of mouth, profile moderately sloping, snout broad and obtuse. Preoperculum serrated behind, operculum with one obtuse spine; branchiostegal rays five on each side. Opercular openings connected below. Front rows of teeth on premaxillaries small, conical, acute, and slightly recurved; those of upper jaw largest, their size decreasing from the middle towards each angle, where there are one or two large canines; those below hidden by the upper jaw. Behind this row in both jaws, a band of velvet teeth in about six irregular rows near the symphysis, but ending entirely near the middle of each ramus. Tongue and vomer toothless. Pharyngeal bones and branchial arches densely crowded with large velvet teeth. Infraorbital bone short, curving up under posterior border of orbit, and not connected with the operculum. Nostrils double, anterior opening smaller, lips rather thick and fleshy. Scales small, numerous, oblong, subquadrangular, finely pectinated, covering the whole body and head as far as front of orbit, but leaving a bare space around the eye. Fins scaleless, as well as caudal rays. Dorsal and anal fins very long at base; spinous rays few. Lateral line normal. DEKAYA ANOMALA, Cooper, n. sp., State coll. No. 618. [FIG. 17.] [Illustration: FIG. 17.] _Specific characters._—Length of head contained five times in total length. Distance from end of snout to orbit one-third the length of head, and greater than width of orbit. Height of head just behind orbit about equal to distance from tip of snout to edge of preoperculum; breadth one-third to one-half of its length. Skin on occiput elevated from the bone by a thick layer of fat, not by any bony expansions.