230 XILVHXDJE. 



below the dorsal fin ; anal and caudal colourless. A blackish 

 vertical bar below the eye ; body minutely punctulatcd with 

 black. 



10. Callichthys paleatus. 

 Callichthys paleatus, Jcnyns, Zool. Beagle, Fish. p. 113. 

 D.y|l. A. G. T. 1/7. V. G. 



Head slightly compressed, its height being very little less than its 

 length ; the upper profile of the snout curved. Maxillary barbels 

 reaching to beneath the middle of the eye ; two short cirri, only half 

 the length of the maxillary ones, pendent from the reflcxed lower lip. 

 Twenty-one lateral shields in the upper scries, and twenty in the 

 lower. Caudal fin forked. Yellowish brown, with dusky spots and 

 mottlings ; lower parts whitish. Dorsal and caudal spotted. (Jenyns.) 



Hah. ? 



11. Callichthys aeneus. 



Lloplosoma ameum, Gill, in Ann. Lye. Nut. Hist. New York, 1858, vi. 

 p. 403. 



D.||l. A. -J, P. 1/7. V.G. 



Very similar to C. paleatus, but all the fins immaculate. 

 Trinidad. 



93. PLEC0ST0MUS*. 



I'lecostomus, sp., Artedi, in Seba, iii. p. 87. 

 I [ypostomus, Lacep. v. p. 144 ; Kner, Ilypostom. p. 250. 

 Ilypostomus, sp., Cm\ ty Vul. xv. p. 48iJ. 



I'lecostomus ot Pscudancistrus, liheh. Nederl. Tydschr. Dicrk. 1803, 

 p. 78. 



A short adipose fin is present, being supported anteriorly by a short, 

 compressed, curved spine ; dorsal fin of moderate length, with eight 

 rays, the first of which is simple, slightly thickened, flexible ; anal 

 fin short ; ventral six- rayed, below the dorsal ; pectoral with a strong 

 spine. Head and body completely cuirasscd, the lower parts being 

 sometimes naked ; body rather short, with four or five longitudinal 

 series of large imbricate scutes on each side ; tail not depressed. 

 Snout produced, obtuse in front ; mouth inferior, transverse, with a 

 single series of generally very fine, bent teeth in both jaws; palate 

 toothless, lntoroperculum without erectile armature. Gill-opening 

 very narrow. 



Continent of tropical America. 



* I . Ilypostomus vcrres, C'uv. 8f Val. xv. p. 404. — Cayenne. 



2. watwata, Hancock, Zool. Joum.iv.p. 246. — Demerara. This species 



has not more than eight dorsal rays, Hancock having used the old style 



of writing, D. — , which means that the fin is composed of eight, rays, 



wiic of which is spinous. The typical specimen appears (o be lost. 



