74 Mr. C. T. Regan on the Fishes of the 



blackisK spots or blotches, one behind the eye, the second on 

 the middle of the side, and the third on the upper half of the 

 base of caudal ; a blackish stripe connecting the spots. Fins 

 dusky. 



Brazil ; Guiana. 



1. (IGl mm.) type of the species. Zoological Society. 



2. {159 mm.) tyi^eoi 11. Goeldii. Rio Counani, French Dr. E. A. Giildi. 



Guiana. 



7. Cichlosoma cori/phcenoides. 



Ileros coryplmnoides, Heck. Ann. Mua. Wien, ii. 1840, p. 373 ; Giintli. 



Cat. Fish. iv. p. 296 (1862). 

 Heros niger, Heck, t, c. p. 375. 

 Acara {Heros) coryphcenoides, Steind. Sitzb. Ak. Wien, Ixxi. 1875, 



p. 84. 

 CicJdasoma coryphcenoides, Pellegr. Mem. Soc. Zool. France, xvi. 1903, 



p. 219 (1904). 



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

 longer than postorbital part of head. Diameter of eye 3§-3| 

 in the length of head, interorbital width 2^-21 . Depth of 

 prseorbital |—| the diameter of eye. Maxillary extending to 

 the vertical from anterior margin of eye ; prsemaxillary pro- 

 cesses not extendiug to above the eye ; jaws equal anteriorly ; 

 fold of the lower lip slightly interrupted ; cheek with 5 series 

 of scales ; 7 or 8 gill-rakers on the lower part of anterior 

 arch. Scales 31-33 ^, 4 between lateral line and base of 

 anterior rays of soft dorsal. Dorsal XVI 12-13 (14), com- 

 mencing above the opercular cleft, the spines subequal from 

 the sixth to the thirteenth, thence increasing to the last, 

 which is more than \ the length of head ; soft fin, when laid 

 back, extending beyond middle of caudal. Anal VI (VII) 

 9-10 (11). Pectoral ^ the length of head, extending to 

 above origin of anal ; ventral extending to middle of anal. 

 Caudal rounded. Caudal peduncle \ as long as deep. 

 Brownish, with obscure darker cross-bars ; a blackish blotch 

 or vertical bar above the lateral line and below the eleventh 

 to thirteenth dorsal spines ; fins blackish. 



Rio Negro. 



1-2. (121 and 127 mm.) Rio NegTo, Mr. J. C. Antony. 



Section 5 {Arcliocentrus). 



Body ovate; scales of lateral line of the same size as those 

 above and below it ; scales of thoracic region considerably 

 smaller than those on the side of the body. Mouth rather 

 small, moderately protractile; maxillary not or slightly 



