The Leather-Jacks 



/. Shoulder-girdle with a deep cross-furrow at its J^ncti^on wi^^^ the 

 isthmus; body slender; Trachurops, 303 



//. Shoulder-girdle normal; body deeper. 



/ Body oblong or more or less elevated, not as below. 



k. Teeth of jaws in few series or one, unequal or at least not formmg 

 villiform bands. , , ^. 



/ Maxillary very narrow; head small; teeth on vomer and palatmes 

 minute or obsolete ; Hermcaranx, 303 



//. Maxillary broad; head rather ^-^^'S^'; ""^^'^ '""^J;^^^^^^^ 



kk. Teeth'lf jaws' equally smaUor wanting, forming villiform bands 



m. Teeth very minute, disappearing in the adult; "« teeth on vomer 

 or Dalatines " arix, ^t'o 



mm. Teeth persistent, in bands; vomer and palatines with mmute 

 teeth 



;/. Soft dorsal with none of its rays produced '"'^Jf^'l^^l'^^^l ^^g 



nn. Soft dorsal with i to 6 rays produced in filaments. 



u Body moderately compressed, its edges not trenchant;..a/«/^, 308 

 00. Body deep, greatly compressed, its edges all trenchant 



p. Soft dorsal lobe very high, tilamentous; ^l ^^> 30« 



pp. Soft dorsal lobe low; , ; Hynn.s 309 



ij. Body broad-ovate, very strongly compressed, ^016, 309 



hhh. Lateral line without any scutes ;...•• • • ■ • • • • • • • • • ; -^^^.Y ' 



/. Dorsal outline less strongly curved than^the je^^^^^^^^^^ ^^^ 



-K^zriThXisr^""^'-"^^^^^ 



qq. Forehead more elevated; Zalocys, 319 



GENUS OLIGOPUTES GILL 

 The Leather-Jacks 



This genus is characterized by the compressed, lanceolate body; 

 slender u^nkeeled caudal peduncle; short, compressed acute head 

 «;hirr> occioital keel" rather large mouth, with small, sharp teetn in 

 bands on Hws vorner and palatines; small, linear, extremely narrow 

 Sswhicrare imbedded in the skin at different angles; unarmed 

 lateral line; and short pectorals. 



In our waters there are but 3 species, none of them of much 

 food-value. The common leather-jack or zapatero (Ohgophtes 



297 



