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



Depth of body l|-2 in the length, length of liead 25-3. 

 Snout longer than postorhital part of head. Diameter of 

 eye 2f-3<} in the length of head, interorbital \iidtli 2^-2^. 

 Depth of prseorbital equal to diameter of eye (adult) or less 

 (young). Maxillary extending to a little beyond the nostril ; 

 prsemaxillary processes not extending to above the eye ; jaws 

 equal anteriorly ; fold of the lower lip not continuous ; cheek 

 with 3 scries of scales ; 5 or 6 gill-rakers on the lower part 

 of anterior arch. Scales 27-29 yiZi2' ^a"^ between lateral 

 line and anterior rays of soft dorsal. Dorsal XIV-XVI 

 10-12, commencing above or behind axil of pectoral, the 

 spines increasing in length to the last, which is |-| the length 

 of head, the soft fin pointed, much produced in the adult. 

 Anal VIII-IX 10-12. Pectoral f-f the length of head, 

 extending to above the fifth anal spine; ventral, iu the 

 adult, extending to the caudal. Caudal rounded. Caudal 

 peduncle ^ as long as deep. Brownish, with an oblique 

 blackish stripe from the snout, through the eye, to the tip of 

 soft dorsal ; a dark ocellated spot on the upper i of base of 

 caudal ; dorsal and caudal fins spotted. 



Guiana ; R. Amazon ; R. de la Plata. 



1. (90 mm.) ? Zoological Society. 



2. (102 mm.) Demerara. F. G. Beckford, Esq. 



3. (147 mm.) Rio Negro. Mr. J. C. Antony. 



4. (72 mm.) Descalvados, Matte Grosso. Dr. Ternetz. 

 5-7. (45-50 mm.) Carandasinlio, Matto Grosso. Dr. A. Borelli. 



8. (106 mm.) Tocantins, Brazil. Paris Museum. 



Section 3. 



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

 above and below it ; scales of thoracic region not very much 

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

 small, moderately protractile; maxillary very slightly ex- 

 posed distally ; teeth of the outer series moderate, distinctly 

 enlarged anteriorly. Dorsal XV-XVII 9-11, the soft fin 

 scaly at the base. Anal VI-VIII 7-9. Pectoral extending 

 to above the origin of anal or a little beyond. Caudal 

 rounded. 



The three species, from South America, show relationship 

 to C. bimucidatum in their general form and in the compara- 

 tively large size of the scales of the thoracic region. 



3. Cichlosoma facetum. 



Chromis facetus, Jenyns, Voy. ' Beagle,' Fishes, p. 104 (1842). 

 Herosfacetm, Giinth. Cat. Fish. iv. p. 210 (1862) ; Steind. Sitzb. Ak. 

 Wien, Ix. 1869, ]i. 290, pi. i. 



