302 CALIFORNIA ACADEMY OF SCIENCES. 



jaw everywhere narrowly produced. x^- -> 

 Intermaxillary band of teeth very shal- f S 3- \ 

 low, scarcely \ diameter of eye in front. 



Gill-membranes confluent with the skin of the isthmus 

 behind the eyes. Gill-rakers 8+13. 



Lateral line somewhat zig-zag, branching. 



Distance of dorsal fin from snout 2| in the length; the 

 spine \\ in head, roughened in front, the basal third of 

 the inner margin smooth, short teeth above. Distance 

 between dorsal and adipose fins 2| in the length; adi- 

 pose fin high and short, half as* long as the dorsal fin. 



Caudal forked, the lobes pointed, the upper a little the 

 longer, \\ in the head. 



Origin of anal one-third nearer base of caudal than to 

 the rictus. Ventrals reaching the anal, 2 in head. 



Pectoral spine nearly smooth on outer margin, serrate 

 on inner margin, the teeth introrse, its length \\ in the 

 head. 



Nearly plain; brown dots on head and back and on 

 base of dorsal fin. 



Head 3|; depth, above origin of anal, 5; Br. 8; D. I, 

 6; A. 30. 



One specimen .094 m. Coary. Professor Louis 

 Agassiz. 



237, Ageneiosus atronasus, 



Ageneiosus atronasus Eigenm. & Eigenm. Proc. Cal. Acad. 2d Ser. 



i, 149, 1888. 

 Habitat: ? Brazil. 



Body as wide as deep under the dorsal spine. Head 

 short, depressed, not much elevated behind the eyes, the 

 profile nearly straight, much less steep than in 

 the head covered with thin skin, the surface of the 

 longitudinally ridged, the greatest width of the head H 

 in its length, width at rictus 1|; the snout as in brevis, 

 broadly rounded in front. Fontanel short, ending over 



