254 TBACHINID^. 



in the total, Caudalis emarginatc ; the spinous portion of the dorsal 

 lower than the soft ; the posterior limb of the prsDoperculura finely 

 dcnticiilated. Uniform brownish. {Jen.) 

 Chatham Island (Galapagos Archipelago). 



Fourth Group. PSEUDOCHROMIDES. 



Pseudochromidae, pt., Milll. ^ Trosch. Ilor. IcMlnjol. iii. p. 22. 



Eyes more or less lateral. Head not cuii'assed. Lateral line 

 interrupted, or not continued to the caudal. 



S>/nopsis of the Genera, 



Cleft of the mouth large ; the upper maxillary produced 



backwards 18. Opistiiognatiius. 



Lateral line interrupted; vomerine and palatine teeth ... 19. P.seudochromis. 



Lateral line interrupted ; teeth on the vomer, none on the 



palatine bones; dorsal spines in small number 20. Ciciilops. 



Lateral line interrupted ; dorsal, anal and ventral spines 



none 21. Pskudoplesiops. 



Lateral line interrupted, the posterior portion continued 



to the caudal; palate smooth 22. Notothenia. 



Scales none 2.3. Farpagifer. 



18. OPISTHOGNATHUS. 

 Opisthognathus, Cuv. Rbgne Anim. ; Cuv. Sf Val. xi. p. 495. 



Body rather elongate, rounded anteriorly, slightly compressed 

 posteriorly ; the upper profile of the snout parabolic ; cleft of the 

 mouth large, the upper maxillary prodiwed backwards ; eye lateral, 

 large. Scales small, not ciliated. Lateral line not continued lo the 

 caudal. One dorsal, Avith the unarticulated rays flexible ; ventrals 

 jugular ; the lower pectoral rays branched. In both the jaws fine 

 cardiform teeth; palate smooth. Oporcles not armed. Six bran - 

 chiostegals ; the gill-membranes joined together inferiorly ; pseudo- 

 brancliia;. Air-bladder small ; pyloric appendages none. 



Red Sea ; East Indian Seas ; coast of Brazil. 



1. Opisthognathus nigi'omarginatus. 



Opisthognathus nigromarginatu.s, liiipp. Ail. Fuche, p. 1 14. taf. 28. f. 4. 



— ^ sonneratii, Cuv. Hx-ync Anini. (without descr.) ; Cuv. 4" Vid. xi. 

 p. 498. 



cuvieri, Valcnc. in Cuv. lik/ne Aiihn. Ill Pniss. pi. 78. fig. 3, but 



not in Cuv. ^ Val. Hist. Nat. Pom. xi., where the same author de- 

 scribes a very different species witii the same name ! 



D. 24. A. 15. 



The upper maxillary prolonged nearly to the pectoral. Scales 

 exceedingly small. The heip-T^t of the body is .six timos in the total 



