236 ^Ir. C T. Regan o)i the South- American 



CHiETOBRANCHOPSIS. 



Chcetohranchns (part.), Steind. Sitzb. Ak. Wien, Ixxi. 1875, p. 128. 

 (.'/uefohranchopds, Steiud. t. c. p. 133 ; Eiijreiiiu. & Brav, Anu. Ac. N. 



York, vii. 1894, p. 609 ; Pellegr. M^m. Soc. Zool. France, xvi. 1903, 



p. 201 (1904). 



Closely allied to Chatobranchns, but with more than 3 

 anal spines, 



A single species from the Amazon. 



Chcetobranchopsis orbicularis. 



ChcBtobranchtis {Chcetobranchopsis) orbicularis, Steiud. Sitzb. Ak. Wien, 



l.xxi. 1875, p. 133. 

 Vluetotn-anchopsis orbicularis, Eigenm. & Brav, Ann. Ac. N. York, vii. 



1894, p. 610; Pellegr. M^m. Soc. Zool. France, xvi. 1903, p. 202 



(1904). 



Depth of body 1 § in the length, length of head 2|. Snout 

 shorter than eye, the diameter of which is 3 in the length of 

 head, interorlntal width 2'^'. Depth of prseorbital less than ^ 

 the diameter of eye. Maxillary extending to below anterior 

 margin of eye. Scales 27 n- Dorsal XVI 13 (XV-XVI 

 11-13), the spines increasing in length to the last, which is 

 ■i the length of head ; soft fin scaly at the base. Anal 

 VI 16 (13-16). Pectoral extending nearly to posterior end 

 of base of anal. Caudal truncate. Caudal peduncle very 

 short. Olivaceous, with traces of darker cross-bars ; a dark 

 blotch on the middle of the side of the body ; vertical fins 

 Mith alternate light and dark stripes or series of spots. 



11. Amazon. 



1. (83 mm.) Marajo Is. Paris Mas. 



II. — Notes ox the Genera of American Cichlid^. 



The diagnostic characters are shown in the following 

 synopsis : — 



I. A notcb between spinous and soft portions of dorsal fin; anal fin 



witb 3 spines ; teeth conical 1. Cichla. 



II. No notch between spinous and soft portions of dorsal fin ; gill- 



rakers very long and slender, numerous ; teeth conical. 



Anal fin with 3 spines 2. Chcetobranchus. 



Anal fin with more than 3 spines 3. Chatobranchopsis. 



III. No notch between spinous and soft portions of dorsal fin ; gill- 

 rakers short or of moderate length, in small or moderate number. 



A. Anal fin with 3 spines ; teeth conical. 

 1. Prteoperculum finely denticulated. 

 Dorsal XIV-XVII 8-9; jaws equal anteriorly. . 4. Crenacara. 



