148 [August, 



species. The upper surface of head exhibits some minute granules when ex- 

 amined with a magnifying glass. There are two slender dorsal spines and 

 and another, small, precedes the soft rays of dorsal fin. Posterior margin of cau- 

 dal subconcave. Ventral spines slander, inserted immediately in advance of the 

 second dorsal spine and very minutely serrated above, inconspicuously beneath. 

 Base of pectorals just in advance of anterior dorsal spine. 



D I. I. I. 10. A I. 9. C 3. 1. 5. 5. 1 . 3. V I. 1 . P 10. 



The body is anteriorly plated as in the preceding species, and smooth poste- 

 riorly. 



Ground color above yellowish, densely dotted with blackish; abdomen silvery. 



From a fresh water lagoon about one mile back of Presidio, Cal., where ac- 

 cording to Lt. Trowbridge, no larger fish occur. 



SCLENID.E. 



17. Umbriwa UNDUL.ATA, G. Greatest length of specimen described, six 

 inches, the head being comprised in it four times and a half. F>ody much com- 

 pressed, particularly the upper part of flanks. Head and snout rounded ; mouth 

 rather small ; posterior extremity of upper maxillary extending to a vertical 

 line which would pass in advance of the orbit. Eye subelliptical, its horizontal 

 diameter being contained five times in the length of side of head. First dorsal 

 subtriangular ; its anterior margin is situated a little behind the base of pecto- 

 rals. The second dorsal, a little higher anteriorly than posteriorly, is twice and 

 a half as long as the first. The caudal is posteriorly subtruncated. The anal 

 is about one third deeper than its base is long, and as deep as the first dorsal is 

 high. The posterior extremity of pectorals extends to a line which would in- 

 tersect the first ray of second dorsal. The tip of ventrals extends beyond that 

 of pectorals without reaching the vent. 



D IX. I. 25. A I. 9. C 3. 1. 7. 7. 1. 2. V I. 6. P 20. 



The scales are of medium size; those on the cheek and opercular apparatus 

 are quite conspicuous, 'foe lateral line is slightly arched under the first dorsal 

 fin, otherwise parallel to the dorsal outline of the body. 



Upper regions silvery-ash ; inferior regions dull yellowish. Sides beneath the 

 lateral line exhibiting obi ique and undulated series of small greyish spots in the 

 midst of a somewhat lighter ground of the same hue. 



From San Diego, Cal. 



18. Glyphisodox RUBicuxDrs, G. The head has a very short appearance ns 

 well as the body itself. The largest specimen measures nine inches and a half 



n total length, of which the head forms a little less than the fourth. The an- 



erior upper part of body is very convex^and the profile of the head very declive 



with two depression?, one above, the other below the ocular region. The mouth 



s small and the lips very fleshy. The eye is situated high up, small and cir- 



' ular, and contained five times in the length of the side of head by its diameter. 



The greatest depth, measured above the ventrals, is a little less than twice the 



length of head. The dorsal fin begins a little behind the base of pectorals ; its 



pinous portion is low and its upper margin almost straight ; the soft part rises 



'ntoa subtriangular shape. The peduncle of tail is well defined, free above and 



below j the dorsal, however, coming nearer to the base of caudal than the anal 



;oes. The caudal is very large, deeply emarginated. but the lobes are uniformly 



rounded and broad. The soft portion of anal has the same conico-trianeular shape 



as the soft dorsal. The ventrals are elongated and inserted behind the base 



of pectorals. The latter are quite broad, rounded upon their external margin ; 



their posterior extremity falling short of that of the ventrals. 



D XII. 16. A II. 15. C 3. 1. 6. 7. 1. 2. V I. 5. P. 19. 



The scales of the body are very large, and so are those of the opercle. On 

 the preopercle and cheek they are smaller. The scales extend to the dorsals, 

 caudal and anal fins to nearly their extremity: on the spinous dorsal they are 

 very conspicuous, whilst they become very small and almost minute on the 

 caudal, soft dorsal, and anal. 



The color is uniform deep crimson red throughout. The ventrals are exter- 



