26 ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
Both this last fin and the anal terminating in a considerable point behind. Ventrals large, 
reaching very nearly to the anal. 
1D), 8—9's An 7 Colas Re. 5 bs 16s Vn die. 
Length 7 inches 9 lines. 
Cotour.—(In spirits.) Dark brownish yellow, with faint indications of three dusky patches or 
abbreviated transverse fascize, one beneath each dorsal, and the third on each side of the upper 
part of the tail. Second dorsal and anal crossed by several whitish longitudinal lines; the 
posterior point of each fin nearly black. 
This species was obtained by Mr. Darwin at Tahiti. It is probably the U. 
trifasciatus of Cuvier and Valenciennes, who received their specimens from the 
Carolinas and Sandwich Islands. But it does not so well accord with the Mulle 
multibande of Quoy and Gaimard, which is supposed by the authors of the ‘“ His- 
toire des Poissons,” to be the same as their species. If the figure in the Zoology 
of ‘“‘ Freycinet’s Voyage” be correct, the Mulle multibande has the nostrils much 
smaller, and the spines of the first dorsal much stronger; the ventrals also are 
relatively much shorter, so as to reach very little more than half way to the anal. 
Future observation must determine whether the two fish are distinct or not. 
3. Upeneus Prayensis. Cuv. et Val.? 
Upeneus Prayensis, Cur. et Val. Hist. des Poiss. tom. iii. p. 357. 
Form.—Very much resembling that of the U. trifasciatus, but with the following differences. The 
eyes rather larger, distant from the end of the snout rather more than two diameters and a half. 
Suborbitals traversed towards their lower margins by a number of lines, each terminating in a 
pore, and with their whole disks studded besides with pores without lines: the lower margin 
itself presents four distinct deeply-cut notches, the first of which receives the end of the maxil- 
lary when the mouth is closed. A single row of small conical teeth in each jaw; in addition 
to which, in the upper, there are some stronger ones in front, exterior to the others, amounting 
to eight in number, the central pair of which bends inwards or towards each other, and the 
three on each side, which are the strongest of all, backwards and outwards. No teeth on the 
vomer or palatines. The posterior extremity of the maxillary is much narrower than in the 
last species. Spine of the opercle sharp and well developed, about two lines and a quarter in 
length. Barbules reaching very nearly to the posterior margin of the opercle. Ramifications 
of the mucous tubes on the lateral line very numerous. Height of the first dorsal equalling 
rather more than half the depth. Space between the two dorsals equalling half the length of 
the second dorsal. This last fin pointed behind, as well as the anal, but not so much so as in 
the U. trifasciatus. Pectorals when laid back reaching to a vertical line from the extremity of 
