244 SCLEEODERMI. 



spine strong, barbed behind, but not in front, rather shorter than 

 the head, situated above the posterior half of the orbit. Caudal 

 rounded, of moderate length ; dorsal and anal fins low. Ventral 

 spine very short, not moveable. Brownish, with some indistinct 

 darker blotches. 

 New South Wales. 



a-«. Adult (9 inches) and half-grown. Sydney. From IMr, Krefft's 



Collection. 

 d. Young. Australia. Presented by the Earl of Derby. 

 e-h. Half-grown : skins. Australia.* 

 *. Adult : skeleton. Sydney. Presented by G. Krefft, Esq. 



21. Monacanthus rudis. 



Monacanthus rudis, Richards. Trans. Zool. Soc. iii. p. 1G6, and Voy. 

 Ervh. Sf Terr. Fish. p. 65, pi. 40. figs. 7 & 8 : ? Hollard, Ann. Sc. Nat. 

 18.54, ii. p. 339. 



D. 34-35. A. 34. 



Eody covered with minute, rough, but distinct scales, Body ob- 

 long, its depth being two-fifths of the total length (without caudal). 

 Pectoral fin situated behind the vertical from the orbit. Snout 

 long, Avith the upper profile couvex. Dorsal spine inserted above 

 the posterior half of the orbit, of moderate strength, two-thirds as 

 long as the head, armed with a double series of small barbs behind, 

 rough in ft-ont. Caudal fin rounded, dorsal and anal fins low. Ventral 

 spine very small, fixed. BrowB, uniform or with four indistinct, 

 broad whitish longitudinal bands. Caudal fin with a broad blackish 

 margin. 



Tasmania. 



a. Nine inches long : stuffed. Port Arthur. — Type of the species. 

 Eight inches long : stuffed. Tasmania. 



2. The barbs are lateral, pointed oidivards and downwards. 

 22. Monacanthus ayraudi. 



Balistes apaudi, Q^ioy ^ Gaim. Voy. Uran. Zool. p. 216, pi. 47. 



fig. 2. 

 Aluteres velutinus, Jenyns, Voy. Beagle, Fish. p. 157. 

 Monacanthus vittatus, (Solander) Richards. Voy. Ereb. 8f Ten-. Ichth. 



p. 66 : Steindachner, Sitzgsber. Ak. Wiss. Wien, 1866, liii, p, 476, 



and 1867, Ivi. p. 336. 

 frauenfeldii, Kner, Novara, Fisch. p. 397. 



D. 32. A. 31. 



Skin rough, velvety. Body elongate, its depth being one-third 

 or rather less than one-third of the total length (without caudal). 

 Pectoral fin situated below the hinder, half of the orbit, immediately 

 in front of the vertical from the dorsal spine. Snout very long, 

 rather obtuse, with the upper profile a little convex. Dorsal spine 

 rather feeble, compressed in the direction of the longitudinal axis of 

 the bodv, armed with a single lateral scries of barbs. Caudal fin sub- 



