22 MR. C. TATE REGAN ON THE 
Depth of body about 4} times in the total length, length of head 3 times. Head 
slightly longer than broad and 1 times as long as deep. Diameter of eye 7} times in 
the length of head, interorbital width 2} times, length of snout 14 times. Length of 
mandibular ramus 32 times in the interorbital width. Snout narrowed anteriorly ; 
supraoccipital with a strongly elevated median ridge; supraorbital edges scarcely 
raised ; temporal plates carinate; interoperculum armed with 12-15 spines, the 
longest 1} times the diameter of eye. Scutes mostly carinate, 28-29 in a longitudinal 
series, 6-7 between dorsal and adipose fin, 15 between anal and caudal. Supraoccipital 
bordered posteriorly by a median scute and one on each side; 3 series of scutes 
between nuchal and posthumeral series. Lower surface of head and abdomen 
completely covered with small granular scales. D. I 12-15; length of base of dorsal 
about 1% times its distance from the caudal. A.14. Pectoral spine extending to 
anterior } of ventral; caudal emarginate. Caudal peduncle 2% times as long as deep. 
Dark, with light spots or vermiculations on head, body, and fins. 
Total length 190 mm. 
One specimen: R. Amazon; Eastern Brazil. 
6. ANCISTRUS MULTIRADIATUS. 
Aypostomus multiradiatus Hancock, Zool. Journ. iv. 1828, p. 245. 
Hypostomus pardalis Casteln, Anim, Am. Sud, p. 42, pl. xx. fig. 3 (1855). 
Liposarcus multiradiatus Ginth. Cat. Fish. v. p. 238 (1864). 
Liposarcus pardalis Giiuth. t. ec. p. 239. 
Liposarcus varius Cope, Proc. Ac. Philad. 1871, p. 284. 
Liposarcus jeanesianus Cope, ib. 1874, p. 135. 
Plecostomus pardalis Peters, Monatsb. Ak. Berl. 1877, p. 471 ; Steind. Denkschr. Ak. Wien, xliii. 
1881, p. 112; ib. xlvi. 1882, p. 6. 
Pterygoplichthys pardalis Kigenm. & Wigenm. Proc. Cal. Ac. (2) 11. 1889, p. 45; Occ. Pap. Cal. 
Ac. i. 1890, p. 431. / 
Pterygoplichthys jeanesianus Figenm. & Eigenm. |. e. et t. c. p. 433. 
Pterygoplichthys multiradiatus Bigenm. & Eigenm. Occ. Pap. Cal. Ac, 1. 1890, p. 433, 
Depth of body 43-53 times in the total length, length of head 5-33 times. Head 
11 times as long as broad and 13-13 times as long as deep. Diameter of eye 64-9 
times in the length of head, interorbital width 2-2} times, length of snout twice. 
Length of mandibular ramus 34—4 times in the interorbital width. Snout somewhat 
narrowed anteriorly, entirely granular; supraoccipital with low median ridge; supra- 
orbital edges not or very slightly raised; temporal plates usually carinate; inter- 
operculum not notably spinate. Scutes spinulose, mostly carinate, 28-30 in a 
longitudinal series, 6 between dorsal and adipose fin, 11-15 between anal and caudal. 
Occipital bordered posteriorly by a median scute and by 1 or 2 scutes on each side ; 
3 or 4 series of scutes between the nuchal and posthumeral series. Lower surface, in 
the adult, completely covered with small granular scales, D. I 12-13, the first ray 
less than the length of head in the adult; length of base of dorsal 14-1} times its 
