316 CHEOMIDES. 



Branchial arches vdth the anterior prominences very ohsolete. Cleft 

 of the mouth smaU and veiy oblique. Scales on the cheek small, in 

 numerous series. 

 Brazil. 



1. Symphysodon discus. 



Heckel, I c. p. 333. 



D. 9.. A. -^^. L. lat. 52. L. transv. 17/34. 



^' SI 87 (-24) ' 



Nearly as high as long (the caudal not included). Scales on the 

 cheek small, arranged in seven or eight series. Brown, with a 

 vertical band descending from the nape to the eye, another band 

 round the base of the caudal, and sometimes a third across the middle 

 of the body. 



Brazil. 

 a. Adult. Eiver Cupai (800 miles from the sea). Purchased of 

 Mr. Stevens. 



19. PTEROPHYLLUM. 



Pterophyllum, Heckel, Brasil.Fluss-I^sche, in Ann. Wien.Mus. ii. 1840, 



p. 334 

 Plataxoides, Casteln. Anim. nouv. ou rares deVAm^r. Sud, Poiss. p. 21. 



Body much compressed and elevated, covered -with ctenoid scales 

 of rather small size. The soft portions of the vertical fins are more 

 developed than the spinous ; anal spines six. The basal portions of 

 the dorsal and anal scaly. The teeth in the jaws form narrow bands. 

 The anterior prominences of the outer branchial arch setiform, rather 

 short. Cleft of the mouth oblique, of moderate width. Scales on 

 the cheek small. Anterior part of the soft dorsal and anal, and the 

 first ventral ray exceedingly long ; caudal truncated. 



Brazil. 



1. Pterophyllum scalaxe. 



Platax scalaris, Cuv. ^ Vol. vii. p. 237. 

 Pterophyllum scalaris, Heckel, I. c. p. 335. 

 Plataxoides dimierilii, Casteln. I. c, pi. 11. fig. 3. 



D..^^ A. ,4. L. lat. 37-40. 



Head and body somewhat longer than high (the caudal not 

 included). Silvery, with four blackish vertical bands : one from the 

 origin of the dorsal, through the eye, to the chest ; the second from 

 the middle of the spinous dorsal to the vent ; the third is the broadest, 

 crossing the middle of the tail ; the fourth round the base of the 

 caudal. Some less dark bands descend downwards between the 

 others to the middle of the body. Dorsal and anal with longitudinal, 

 caudal with transverse blackish bands. 



Brazil. 

 a. Fine specimen. Eiver Cupai (800 miles from the sea). Purchased 

 of Mr Stevens. 



