Jordan ayid Evermann. — Fishes of North America. 1367 



6&. Second interhaemal spine normally developed, not hollow, the air bladder not 



entering it. 



e. Second interhsemal spine very short, bluntish; anal spines 2, both small; 



preopercle and preorbital entire. XJl^ma, 5C0. 



cc. Second interhaemal spine long, spear-shaped; anal spines 2 or 3, the second 



enlarged. 



A. Preopercle entire ; second anal spine moderate. Xyst;ema, 561. 



dd. Preopercle serrate; second anal spine much enlarged. Gerres, 562. 



559. EUCINOSTOMUS, Baird & Girard. 



(MOJAKRITAS.) 



Eucinostomus, Baird & Girard, Ninth Smith. Report 1855, 20 (aiyenteus). 



Interluemiil bone of the second anal sx)iue greatly modified, expanded 

 into a hollow cylinder, into which the posterior end of the air bladder 

 enters. Preopercle and preorbital entire; body comparatively elongate, 

 8nbellij)tical in form; anal spines 3; the second anal spine and fourth 

 dorsal spine not greatly enlarged. Species numerous in warm seas, re- 

 markable for the structure of the second iuterha-mal, which is fonued 

 somewhat as in Calamus, but much more modified than in the latter genus. 

 (sv, well; Hivsoi), to move; droua, mouth.) 



a. Premaxillary groove wholly naked, linear or scmioval, sometimes constricted at 

 base, but never scaled ; anal rays III, 7. 

 h. Eye very large, its diameter much greater than length of snout, 2| in length of 

 head. Exposed portion of maxillary small, triangular ; premaxillary groove 

 linear. dowi, 1743. 



hb. Eye moderate, usually more than 3 in head, its diameter about equal to length 

 of snout. Exposed portion of maxillarj' triangular in front, oblong behind. 

 e. Body elongate, the back little elevated; greatest depth 3i to 3i in length. 

 Anal spines small, the second 4J in length of head, pseudogula, 1744. 

 cc. Body more compressed, deeper, the back more elevated; greatest depth 

 2j in length. 

 d. Snout blunt; eye large, scarcely 3 in head; second anal spine large, 

 2j to 31 in head ; premaxillary groove linear, harengultjs, 1745. 

 dd. Snout less blunt; eye not so large, more than 3 in head; second anal 

 spine shorter, 3J to 4J iu head ; the premaxillary groove becom- 

 ing broader with age, linear in the young ; spinous dorsal black 

 at tip, especially in the young. californiensis, 1746. 



aa. Premaxillary groove scaled in front, the scales leaving a naked pit behind. Depth 

 2g in length; head 3 to 3J in length of body. Second anal spine about 3J in 

 head. gula, 1747. 



1743. EUCINOSTOMUS DOWI (Gill). 



Head 3*; depth 3; eye large, 2f in head; snout 3i, and interorbital 3^; 

 in head; scales 5-45-10. Body rather slender, compressed, elliptical, back 

 little elevated, head flat, with a slight depression above front of orbit. 

 Maxillary triangular and small, the width at the posterior end being ^ the 

 length, which is about i diameter of eye, also | length of second dorsal 

 spine. Preorbital and preopercle entire. Second and third dorsal sjiines 

 about equal, the third, perhap,s, slightly longer, If in head, all weak and 

 flexible. Second anal spine relatively strong, third weaker, but slightly 

 longer, 2f ; base of anal 1^ to 2^ in length of head; least depth of caudal 



