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Show FISH. 8.') the pectorals and caudal: anal with a dusky edging. In the living state there were probably some bright coloUI's, as in the B. biocellatus of Cuvier and Valenciennes. A second specimen has the fin-ray formula as follows :- D. 13/18; A. 21, &c. This specimen also differs from, the one above in having the teeth in the lower jaw not quite so numerous, and the ventrals longer, equalling one-seventh of the entire length. The colours are on the whole similar, but more of the yellow ground is visible above the median line, and the descending fascire beneath it are not so distinctly traced out. Habitat, Concepcion, Chile. This species is very closely allied to the B. biocellatus of Cuvier and Valenciennes, from the same coasts. It agrees with it in all its essential characters, and in the general disposition of the markings. It appears to differ, however, in having fewer teeth; in the anal reaching hardly so far as, certainly not beyond, the dorsal, as described to be the case in that species ; in the fin-ray formula; and slightly in the colours. The B. biocellatus derives its name from two ocellated spots, one beneatlt the 1ast rays of the dorsal, the other upon the first three rays of that fin. In the B. fasciatus here described, there appear to be three subocellated spots beneath the dorsal, though the last is the most distinct, besides the one upon the fin itself. The B. biocellatus was observed by M. Gay at Valparaiso. The present species was taken by Mr. Darwin at Concepcion. Possibly it may be a mere variety. 2. BLENNECHIS ORNATUS. Jen. PLATE XVII. Fig. 2. B. cinereo-griseus; maculis, vel lituris paucis, infra pinnam dorsalem obsoletis, pallide nig1·icantibus: dentibus caninis nullis: tentaculis patpebralibus duobus, parvis, subfurcatis: pinna anali !tattd ult1·d dorsalem extensa. D. t~/17; A. 20; &c.LoNG. unc. 2. lin. 2. FonM.-Closely resembling the last species, but rather deeper in proportion to its length, less compressed in front, with the head more inflated about the throat and gills. Snout, profile, and position of the eye, similar. Superciliary filaments scarcely longer, but ratl1er broader and more conspicuous, and cleft at the extremity. Filaments at the nostrils a little longer, but very slender and delicate. Teeth similar, both in number and form. Fins and lateral line exactly similar. Behind the vent a papilla not present in the last species. CoJ.Oun.-Different from that of the B. fasciatus, but with traces of the same markings. The ground colour is cinereous grey, which almost every where prevails: there are faint traces of the angulated fasciw beneath the chin, as well as of three dark stains beneath the dorsal, but these last no longer deserve the name of ocellated !!pots. Fins, cheeks, and gill-covers, |