274 PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 



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fishes found along the southern coast of California extend the^r range 

 as far southward as Cape San Lucas or Mazatlau. Only about ten 

 species of shore fishes are known to occur both at San Diego and Mazat- 

 lan. In the region between San Diego and Magdalena Bay, the Califor- 

 nian fauna and its characteristic species almost wholly disappear, giving 

 place gradually to the tropical fauna of the west coast of Mexico. Even 

 the Labridcc, Pomacentridce, and Sciccnidce of California do not extend 

 southward to Mazatlan. 



A. — Species from the Gulf of California. 



29,377. Serranus radialis (Quoy & Gaim.) J. & G. Punta San Ignacio, 



Mexico. 

 29,3<S8. Mugil mexicamis Steind. Same locality. 

 29,353, 29,333, 29,373. Tetrodon poUtus Ayres. Same locality. 

 29,362. Cj/noscion parvipinne A^yies. 'Guay mas, Mexico. 

 29,386. Pomadasys linornatus (Gill) J. & G. Guaymas, Mexico. 



This specimen has 58 scales in a longitudinal series, the dorsal and 

 anal fins almost naked, the anal rays III, 11, and the snout rather long, 

 more than one-third length of head. It differs in all these respects 

 from the description of Pristipoina hrempinne Steindachner = ? Micro- 

 lepidotus inornatus Gill. 



29.355. Gerres calif orniensis (Gill) J. & G. Guaymas, Mexico. 

 29,800. Gerres graciUs (Gill) J. & G. Guaymas, Mexico. 

 29,357. Semirhamphus unifasciatus Kanzani. Guaymas, Mexico. 



29.356. Mugil brasiliensis Agass. Guaymas, Mexico. 



29,368. Porichthys porosissimus (C. & V.) Gthr. Gulf of California 



(dredged in 15 fathoms). 

 29,385. Cynoscion othonopterum sp. nov. Punta San Felipe, Mexico. 



Description. — Body rather elongate, the back somewhat elevated, the 

 profile from tip of snout to front of dorsal nearly straight; caudal 

 peduncle rather long and slender, its depth 4 in head. Head long and 

 pointed, compressed, not regularly conical. Mouth large, the lower jaw 

 projecting; maxillary broad, reaching to or a little beyond posterior 

 margin of orbit; premaxillaries in front on the level of lower part of 

 pupil; length of gape 2^ in head. Teeth in upper jaw in a moderate 

 band, which becomes narrower laterally; upper jaw with two small 

 canines, their length scarcely one-fourth diameter of pupil ; some of the 

 other anterior teeth enlarged, and larger than the lateral teeth. Teeth 

 in lower jaw in a narrow band in front, in a single series laterally; the 

 lateral teeth much larger than the anterior. Eye moderate, broader 

 than preorbital, narrower than maxillary; its diameter 6| in head, a 

 little more than half interorbital space. Preopercle with its mem- 

 branaceous border broad, and covered with small scales. Gill rakers 

 long and strong, nearly as long as eye. Scales small, all with con- 

 spicuous membranaceous edges. All the fins excepting spinous dorsal 

 completely covered with small scales, the bases of the fins thickened by 



