216 ME. 0. TATE REGAN ON THE 



Depth of body 5^- times in the total length, length of head 3 times. Depth of head 

 twice in its length, breadth of head ly times, length of snout If times, diameter of eye 

 7 times, interorbital width 2f times. Length of mandibular ramus 2^ times in the 

 interorbital width. Snout broad, rounded ; supraorbital edges not raised ; supra- 

 occipital with low median elevation ; temporal plates not carinate. Scutes spinulose, 

 not carinate, 26 in a longitudinal series, 7 between dorsal and adipose fin, 13 between 

 anal and caudal. Supraoccipital entirely bordered posteriorly by a single scute. 

 Lower surface almost completely naked. D. I 7, the first ray equal to f the length 

 of head, the last ■§■ as long ; length of base of dorsal equal to its distance from the 

 tip of the spine of the adipose fin. A. I 4. Pectoral spine extending a little beyond 

 the base of ventral. Caudal moderately emarginate. Caudal peduncle 2f times as 

 long as deep. Dark spots on head, body, and fins. 



Total length 130 mm. 



One specimen : Bahia. 



19. Plecostomus wuchereri. (Plate X. fig. 2.) 



Plecostomus wuchereri Giinth. Cat. Fish. v. p. 235 (1864). 



Plecostomus brevicaiula Giinth. 1. c. 



Plecostomus lima Liitk. Overs. Dan. Selsk. 1873, no. 3, p. 70, and Vid. Selsk. (5) xii. 1875, 



p. 140. 

 Plecostomus vermicularis Eigenm. Proc. Cal. Ac. (2) i. 1888, p. 170, and Occ. Pap. Cal. Ac. i. 



1890, p. 411. 



Depth of body 6-6^- times in the total length, length of head 3-3-^ times. Head as 

 broad as long or a little longer than broad and If- 2 times as long as deep. Diameter 

 of eye 6-8 times in the length of head, interorbital width 2f-2f times, length of snout 

 If times. Length of mandibular ramus twice in the interorbital width. Snout broad, 

 rounded ; supraorbital edges not, or scarcely, raised ; supraoccipital with low median 

 elevation ; temporal plates not carinate. Scutes spinulose, not carinate, 26 in a 

 longitudinal series, 6-7 between dorsal and adipose fin, 12-13 between anal and caudal. 

 Supraoccipital bordered posteriorly by 1, 2, or 3 scutes. Lower surface of head and 

 abdomen, in the adult, in great part covered by small granular scales ; a large naked 

 area at the base of each ventral, which may extend forward to the level of the base of 

 the pectoral, or may be confluent posteriorly with that of the other side. D. I 7, the 

 first ray as long as the head, the last \— § as long ; length of base of dorsal equal to its 

 distance from the middle or posterior part of the spine of adipose fin. A. I 4. 

 Pectoral spine extending beyond base of ventral. Caudal slightly and obliquely 

 emarginate. Caudal peduncle about 3 times as long as deep. Dark spots on head, 

 body, and fins, those of the dorsal in 1, 2, or 3 series on each interradial membrane, 

 sometimes confluent to form undulating cross-bars. 



Total length 250 mm. 



