THE FISHES OF EASTER ISLAND 67 
counted from a point vertically above the upper eye is quite straight and 
thus forms a hardly perceptible angle with the dorsal curve. Head not much 
higher than long, mouth oblique, maxillary reaching to anterior rim of eye, 
3,6 in head. Pointed teeth in one series in each jaw, about equally developped 
on both sides. Horizontal diameter of lower eye 4,8 in length of head, lower 
orbit wholly in advance of upper, interorbital space 4.1 in head. Nostrils on 
both sides distinct. On the eye-side the nostrils lie on a line horizontally before 
the bony ridge of the upper margin of the lower eye. The posterior nostril 
is surrounded by a low cutaneous border, the anterior opens at the end of a 
small tube, which anteriorly is drawn out into a short, tentacular appendage. 
On the blind side the nostrils lie close to each other near the origin of the 
dorsal fin. Ten short gill-rakers on lower part of first arch, none above. Scales 
on eye-side ctenoid, on blind-side cycloid. Left pectoral fin 2,07, right one 
2,23 in head. ; 
The coloration agrees with the descriptions and figures published by the 
authors quoted above. The skinny flap in the mouth between the teeth and 
vomer is not spotted. 
14. Ostracion pasche n. p. 
One specimen, 152 mm total length (s. c.), 132 mm length of carapace. 
Head 3,5 in total length, 3 in carapace; height resp. 2,4 and 2,1. Eye 
2,4 in head; snout 1,6; interorbital space 1,5; preorbital width 2,1. Vertical 
diameter of mouth-opening of carapace 2,5 in head. Postdorsal length of 
carapace 6 in total length of the same. D. 8; A. 9; P. Io. 
Carapace four-sided, the bridge across the back of the tail is formed by 
three transverse series of scutes. A pair of short, conical spines slightly 
divergent, and pointing forwards in front of the orbits. A triangular com- 
pressed spine in the middle of the back, a smaller spine on each dorsal ridge, 
opposite to the posterior part of the base of the central spine. Ventral ridge 
terminating behind in a rather strong spine, the two corresponding spines 
strongly divergent. On each ventral ridge there are also two other smaller 
spines, the anterior at the same vertical as the central spine, the posterior 
opposite to the origin of the dorsal fin. Interorbital space deeply concave, 
broadly V-shaped when seen from before and slightly concave from below. 
Head deep, profile above steep, convex, and with projecting snout. Base of 
dorsal about 12 1/3 in length of carapace. Eleven plates from gill-opening to 
end of carapace, twelve along its edge from behind supra-ocular spine, the 
sixth bearing the supero-lateral spine. When counting from the posterior 
unpaired scute at the hind margin of the mouth-opening and obliquely outwards 
we find the fourth plate lying at the anterior end of the ventral ridge. Counting 
this very plate as the first, we state the three ventral spines as placed on the 
6th, 8th and roth plates. Between the plate carrying the first ventral spine 
and the seventh plate of the ventral ridge opposite, there are nine ventral 
plates. Between the central spine and each supero-lateral spine there are two 
longitudinal rows of plates, between the former and the dorsal fin three plates, 
and between the supero-lateral and the anterior ventral spines five plates. 
