304 CHROMIDES. 



outer branchial arch with lanceolate crennlated prominences along its 

 concave side. Dorsal and anal fins scaly. 

 Brazil and Guiana. (Peru.) 



The following osteological notes are taken from a specimen in the 

 Berlin Anatomical Museum, 2| feet long, procured by Schomburgk 

 in Guiana, and named C. monoculus, but with nineteen spines in the 

 dorsal fin : — A strong crest on the head, bifid anteriorly where it 

 belongs to the frontal bones, whilst its posterior part is formed by a 

 portion of the occipital ; there are two other ridges on the side of the 

 crest. The frontal projects very strongly above the orbit, forming a 

 convex roof. Prseorbital large, thick, divided into two by a suture ; the 

 upper piece is the larger, thick, joined to the praefrontal, and cover- 

 ing the maxillary ; the lower is narrow, triangular, pointing towards 

 the infraorbital ring, which is nan-ow and composed of five bones. 

 The dentary has posteriorly a process which forms an acute angle 

 witt the articulary; the latter with a process directed posteriorly 

 for'^ ards ; these two processes nearly touch each other. "Os basilare 

 with an acute ridge. Eighteen abdominal and as many caudal ver- 

 tebrae ; eighteen ribs, Bome of the middle with epipleurals. 



1. Cichla ocellaris. 



Cichla ocellaris, HI. Schn. p. 340. tab. 66 ; Mull, l^ Trosch. in Sc?ioinh. 



Guyana, iii. p. 625. 

 monoculus, Agass. in S^nx, Pise. Bras. p. 100. tab. 63 & tab. E ; 



Heck. Brasil. Fluss-Fisehe, p. 411. 

 atabapensis, Humh. Observ. Zool. ii. p. 168. 



D. 14 1 i A. ■^. L. lat. 88. 



I 10 11 



Ten series of scales between the origin of the dorsal fin and the 

 lateral line. . Caudal rounded. The height of the body is one-fourth 

 of the total length. Back with three black cross-bars ; a black ocellus 

 on the root of the caudal; (a series of black spots on the side of the 

 belly, beginning in the axil of the pectoral ;) ho longitudinal band on 

 the head. 



Fresh waters of Brazil and Surinam. 



a,h. Adult and half-grown. Guiana. Presented by Sir R. Schomburgk. 



c. Adult: stuffed. Demerara. From the Collection of the Zoological 



Society. 



d, e. Half-grown and young. 



Cyda toucounarai, Casteln. Anim. nouv. ou rares Amer. Sud, Poiss. 

 p. 17. pi. 10, fig. 1, is probably identical with this species, but has 

 no black spots on the side of the beUy. 



2. Cichla temensis. 



Cichla temensis, Humh. Observ. Zool. ii. p. 109 ; 7/i^rA-. lirasil. Flus.9- 



Fische, p. 413. 

 tucunare, Heck. I. c. p. 409. 



I>-14|r6^7. A.f L. lat. 110. 



Thirteen series of scales between the origin of the dor.snl fin and 



