228 SILURTD^. 



to, or nearly to, the end of the pectoral fin. Caudal fin slightly 

 forked. Lower parts immaeidate ; caudal without cross-band. 



Brazil; Guianas; Trinidad. 

 a. Half-grown. Demerara. Presented by Dr. Hancock. — Type of 



the species. 

 6, c. Adiolt. British Guiana. Presented by Sir R. Schomburgk. 

 d. Nest of the same, built of grasses. 

 e-h, i, h-l. Adult and half- grown. Demerara. Purchased of Mr. 



Scrivener. 

 m-n. Half-grown. Trinidad. Presented by — Taylor, Esq. 

 o-t. Adult : stuffed. South America. 

 u, V. Adult. From the Collection of the Zoological Society. 

 w. Adult : skeleton. Presented by the Iloyal College of Surgeons. 



6. Callichthys thoracatus. 

 Cuv. ^ Val. XV. p. 309. pi. 443, 



D.||l. A.^. P. 1/9. V.6. 



A pair of large osseous shields between the pectoral fins. Twenty- 

 five lateral shields in the upper series, and twenty-three in the lower ; 

 five shields behind the dorsal fin join vidth the corresponding ones 

 of the other side, without being separated by small azygos shields j a 

 series of about five or six azygos shields before the adipose fin. Intta- 

 orbital bone veiy narrow, only half as wide as the orbit. The barbels 

 extend to behind the end of the pectoral fin. Caudal fin subtruncated. 

 Lower parts immaculate ; fins blackish, the caudal with an indistinct 

 broad dark cross-band. - 



Guianas ; Trinidad ; ? Martinique. 



a. Adult. British Giuana. Presented by Sir R. Schomburgk. 



b. Adult : stuffed. Trinidad. Prom the Collection of the Zoological 



Society. — Veruac. name : Cascadura, or Bush-fish. 

 c-d. Adult: skins. 



7. Callichthys longifilis. 



CaUichthys longifilis, Ctiv. ^' Val. xv. p. 317. 



personatus, Ranzani, Nov. Comtn. Acad. Scient. Instit. Bonon. 



1842, V. p. 322. tab. 24. 



pictus, 3full. (§■ Trosch. in ScJiomb. Brit. Guiana, iii. p. 630. 



PCaUiclithys sidcatiis*, Kner, Sitzt/sber. Wien. Acad. 1855, xvii. p. 110. 



D.||l. A. 7-8. P.gl. V.6. 



A pair of large. osseous shields between the pectoral fins. Twenty- 

 four to twenty-five lateral shields in the upper series, and twenty- 

 four in the lower ; four shields behind the dorsal fin join with the 

 corresponding ones of the other side, without being separated by small 



* All our specimens have a shallow gi'oove in tlie humeral process for the 

 reception of tlie pectoral fin, although in other respects they agree better with C. 

 longifilis than with C. svlcafus. 



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