BULLETIN OF THE UNITED STATES FISH COMMISSION. 315 



c. Teeth of lower jaw unequal, not villiforni, the inner series rather strong ; month 

 very large, oblique, the jaws equal, the snout not projecting 

 beyond the preniaxillaries, which are on the level of the eye; 

 maxillary extending beyond eye, its length more than half head ; 

 interorbital width nearly half head ; preopercle with two spines 

 only, the n^jper directed backward, the lower downward and 

 backward ; second anal spine rather strong, If in head ; lower 

 fins pale. D. XI-I, 22 ; A. II, 8 ; Lat. 1. 48 Oscitans. 



cc. Teeth of lower jaw equal, villiform. 

 d. Mouth terminal, the jaws subequal, the snout scarcely projecting beyond the 

 premasillaries, which are on the level of lower part of eye ; 

 maxillary reaching middle of eye, its length 2^ in head ; inter- 

 orbital width less than one-third head; preorbital and preop- 

 ercle extremely cavernous ; preopercle with numerous spines 

 all directed backward ; second anal spine not large, 2i in head ; 

 lower fins dusky. D. XI-I, 25; A. II, 7 ; Lat. 1. 47..Ei^icymba. 

 dd. Mouth subterminal, the lower jaw included, the snout projecting beyond 

 the premasillaries, which are below the eye; maxillary reach- 

 ing to behind pupil, 2i: in head; interorbital width more than 

 one-third head ; bones of side of head scarcely cavernous ; pre- 

 opercle with two spines only, the upper directed backward, 

 the lower downward and forward ; second anal spine small, 2J 

 in head; lower fins pale. D. XI-I, 23; A. II, 9 ; Lat. 1. 46. 



FURTHI.* 



1)1). Head not very broad, the interorbital space less than two-sevenths its length ; 

 bones of head not cavernous. 

 e. Gill-rakers extremely short, scarcely longer than posterior nostril ; mouth 

 small, more or less inferior, horizontal; lower teeth villiform, 

 in rather broad bands; preopercle with strong teeth, none of 

 them directed downward or forward ; anterior profile more or 

 less concave. 

 /. Caudal fin lanceolate, nearly as long as head ; body rather elongate, 

 depth 3-i in length ; head low, slender, the maxillary reaching 

 middle of eye ; snout projecting beyond preniaxillaries ; second 

 anal spine strong. If in head ; jiectorals short. If in head ; color 

 grayish ; anal and ventrals largely black. D. X-I, 22 ; A. II, 



7; Lat. 1. 44 Opiiiosciox.t 



ff. Caudal double-truncate or double-concave, miich shorter than head. 



g. Snout much projecting beyond the premaxillaries ; head low, very 

 slender; body rather deep, compressed, the de])fli 3 iu length; 

 second anal spine small, 2^ m head ; pectoral 1-'- in head ; dorsal 

 spines slender; color grayish ; anal and ventrals largely black. 

 D. XI-I, 25 ; A. II, 8 ; Lat. 1. 49 Imickps. 



gg. Snout scarcely projecting beyond the premaxillaries ; head not very 

 slender; body robust, its depth 3 in length ; second anal spine 

 moderate, 26 in head; color dusky, with blackish stripes along 

 the rows of scales; ventrals and anal largely black. D. X-I, 

 24; A. II, 7; Lat. 1. 47 VEK.AiicuLAKis.t 



* Corrina (Homoprion) filrtM Steiudachner, Ichthyol. Beitr. iii, 26, 1875, taf. iii. 

 Panama {Sfeixd. GUI).). 



t Ophiosdon iypicm Gill, Proc. Ac. Nat. Sci. Phila. 1883, 164; Corvina ophioscion Giin- 

 ther, Fish. Centr. Amer. 18139, 428. Panama (Gill, Steind. Gthr. Gill).). 



{ Corvina vcrmienlarin Giinther, Fish. Centr, Amer. 1869, 427, pi. Ixvii, f, 2. Mazatlan 

 {Gdb.); Panama (Gi/tr.). 



