— 1864.) DR. A. GUNTHER ON GUATEMALAN FISHES. 147 
very indistinct dark cross bands on the back, which appear to be 
arranged as in P. leuciscus. 
Two specimens, 11 and 14 inches long, were collected by Mr. 
Salvin at Chiapam. 
PRISTIPOMA LEUCISCUS. 
D. 11/5. A. 3/7-8. L. lat. 51. L. transv. =. 
10 
The height of the body is contained thrice or thrice and a third 
in the total length (without caudal), the length of the head thrice 
and a fourth. The diameter of the eye is equal to, or more than, 
the width of the interorbital space, but less than the extent of the 
snout. The maxillary does not quite extend backwards to the ver- 
tical from the anterior margin of the orbit. Praeoperculum finely 
serrated behind, with the angle rounded, and with the hind margin 
slightly curved. The spinous and soft portions of the dorsal fin are 
separated by a deep notch, the spine of the soft portion being nearly 
twice as long as the preceding. Dorsal spines long, of moderate 
strength: the third is the longest, and one-half, or more than one- 
half, as long as the head. Anal spines rather strong: the third is 
a little longer than the second, equal to the seventh dorsal spine, 
and more than one-third of the length of the head. Caudal fin 
emarginate. Each soft ray of the vertical fins is accompanied by a 
series of minute scales. ‘The pectoral fin extends to the vertical 
from the origin of the anal in the younger example, but is shorter 
in adult ones. Scales smooth, bright silvery ; young specimens with 
several very indistinct dark cross bands on the back, the first from 
the nape of the neck to the gill-opening, the second below the seventh 
dorsal spine, the third below the last dorsal spine; old specimens 
with the marginal membrane of the operculum black. 
One specimen, 74 inches long, was found by Mr. Salvin at San 
José. Three others, from 11 to 12 inches long, are from Chiapam. 
CoNODON PACIFICI. 
D.1ij5. A.3. L. lat. 47. L. transv. 7/13. 
The spinous teeth at the angle of the preeoperculum are not much 
stronger than the others. The height of the body is contained twice 
and two-fifths in the total length (without caudal). 
One specimen, 124 inches long, was collected by Mr. Salvin at 
Chiapam. 
H2MULON MARGARITIFERUM. 
12 3 py 
D.5 A.y. L. lat. 55. L. transv. 6/15. 
The height of the body is one-third of the total length (without 
caudal), the length of the head two-sevenths. The diameter of the 
eye is two-sevenths of the latter, and equal to the extent of the snout 
and to the width of the interorbital space, which is very convex. 
The maxillary extends beyond the vertical from the anterior margin 
of the eye. Praeoperculum emarginate behind. Dorsal fin scarcely 
