THE FISHES OF THE JUAN FERNANDEZ ISLANDS 55 



4. Gilbertia semicincta Cuv., Val. — Plectropoma semicmctum Cuv., 

 Val., Hist. Nat. Poiss., IX, 1833, p. 442 (Juan Fernandez) — GAY 1848, 1. c. p. 

 153 and At). let., lam. 2, fig. i (Juan Fernandez). — GtJNTH., Cat. Fish. B. 

 M., I, 1859, p. 160 (Juan Fernandez; Australia) — Steind. 1875, 1. o. p. 6 

 (Juan Fernandez) — Delfin 1899, 1. c. p. 148. — Gilbertia semicincta Boul., 

 Cat. Fish. B. M., I, 1895, p. 307 (Coasts of South-eastern Australia, New Zea- 

 land and Chile). — Steind. 1897, ^- c. p. 282 (Juan Fernandez). 



One specimen, 157 mm. (s. c), Masatierra ^^4 1917. 



Six specimens, 156, 133, 108 — 89 n^^"- (s. c.), near the shore in a depth 

 of 15—20 m.; Masatierra ^"/s 1917. 



To the description of this species may be added the following data. On 

 the samples preserved in spirits the upper part of the head is variegated with 

 light and dark colour markings. From the lower anterior margin of the eye 

 there runs a broad dark bar over the side of the snout and the upper lip to 

 the border of the mouth. Corresponding to each of these bars there is also 

 a dark spot on the lower lip. The hind border and the lower border of the 

 eye is encircled by a narrow dark bar, which merges into the mentioned prae- 

 ocular bar. Along the lower jaw there also runs a dark bar. Otherwise the 

 coloration is in agreement with the descriptions given by previous authors. 



5. Callanthias platei Steind. 1897, 1- c. p. 284, pi. XV (Juan Fer- 

 nandez). 



One specimen, 176 mm. (s. c), Masatierra ^^/4 1917. 



6. Chilodactylus nionodactylus Carmich.  — Chaetodon monodactyhis 

 Carmich., Tr. Linn. Soc, XII, 1817, p. 500, pi. 24 (Tristan da Cunha). — Clieilo- 

 dactylus Cannichaelis Cuv , Val., Hist. Nat. Poiss., V, p. 360 (ref. to the above 

 descr.) and IX, p. 489 (Juan Fernandez). — Gay 1848, 1. c. p. 197 (Juan Fer- 

 nandez). — Chilodactylus monodactyhis GUNTH., Cat. Fish. B, M., II, i860, p. 

 81 (»Coasts of Chile»). — Steind. 1875, 1. c. p. 14 (Juan Fernandez). — 

 GiJNTH., 1880, 1. c. p. 24 (Juan Fernandez). — Delfin 1898, 1. c. p. 162 

 (Masafuera). — Steind. 1903, 1. c. p. 205 (Juan Fernandez). 



One specimen, 95 mm. (s. c.) ^^/4 191 7. 



The coloration of the present specimen (in spirits) differs considerably 

 from the description of Ch. nionodactylus, on account of which I refer it to this 

 species with some doubt. 



It agrees with mojiodactylus in having a dark area from the fore-back to 

 the base of the pectoral, an obscure spot below the eye, and the tip of the 

 opercle dark coloured. There are, however, no traces of any vertical bands 

 to be seen on the body. The ground colour is on the upper half of the body 

 light brown. The middle part of each scale is silvery, in this way the upper 

 half of the body is occupied by 7 horizontal bars formed by silvery spots. 

 Between these the ground colour appears as continuous length-bars of about the 

 same width. The lower half of the body is silvery. 



The proportions of the specimen are as follows: Height in length 2,6 

 (2,4 s. c), head 3 ^/4 (3,4) in the same. Snout and eye subequal, 2,9 in head. 

 Interorbital space 1,3 in eye and 3,7 in head. Prsedorsal space 2,9 in tot. 



