24 FOSSIL FISHES OF SOUTHERN CALIFORNIA 



Z l /%. Vertebrae about 17 -{-25 = 42, the number of caudal vertebras not 

 to be exactly counted. Dorsal apparently small, inserted slightly behind 

 the middle of the body, nearly opposite the ventral fin, which is short. 

 Pectoral short, of 14 rays; inserted low, its length Z l / 2 times in depth 

 of body; caudal forked. The stout, shortish ventral seems to contain 

 more than six rays. The opercle is rather strong and' rounded behind; the 

 occipital crest is rather high and the mandible seems strong. The bones 

 of the head cannot be made out. The vertebrae are strong, numerous, and 

 distinctly hourglass-shaped, with rather strong neural spines; ribs mod- 

 erate. 



The scales are characteristic, rather large, thick, and covered with 

 ganoine, almost as in GANOLYTES CAMEO. They seem to be regularly ar- 

 ranged, between 12 and 18 in a cross series. Some of the scales show 

 traces of digitate markings, but less distinctly than in GANOLYTES CAMEO. 



Family ROGENIIOffi. 



20. Rogenio vanclevei Jordan and Gilbert, new species. 

 (Plate XXXI, fig. 3) 



Type a little fish \ l /$ inches long (No. XXIII), from a gritty diato- 

 maceous shale of Miocene age at Bairdstown, near Los Angeles. 



Except for the much greater distinctness of its various bones it can- 

 not be distinguished from the genus ROGENIO, the type species of which 

 abounds in the Soledad deposits. 



Body elongate, lanceolate, deepest anteriorly, the depth about eight in 

 length. Head large, depressed, its length 4*4 to base of caudal; bones 

 of head obliquely placed; jaws long, subequal, the maxillary extending to 

 beyond the eye; opercle strongly convex behind; vertebrae 32 or 33, 17 

 behind the vent; dorsal fin inserted about midway from nape to base of 

 caudal, its rays not well shown, about eight in number, rather low ; anal 

 similar, inserted a shade behind the dorsal, caudal peduncle behind these 

 fins much longer than their base, the length greater than depth of body. 

 Pectoral imperfectly shown, inserted rather low, not much shorter than 

 head but narrow and slender ; a vague trace of a small ventral midway 

 between pectoral and anal; this perhaps fallacious; ribs delicate, well 

 preserved ; neural and haemal spines strong ; hypural plate not evident ; 

 caudal deeply forked, as long as head. 



This fish probably is congeneric with ROGENIO SOLITUDINIS, with 

 which it agrees in the anterior insertion of the anal, almost exactly opposite 

 the dorsal. Its relations to any group of living fishes are uncertain. 



The type was collected at Bairdstown in diatomaceous shale by a class 

 of students from the Los Angeles High School under direction of Mr. Ray 



