226 L. Agassiz on 
quite as prominent; hence the head is longer than high. 
The posterior border of the orbit is nearer the angle of the 
opercle than the end of the snout. The upper and lower 
curves of the body are equal, and approach more nearly 
towards the tail, making this latter narrower than in the 
first species. The scales of the back do not descend upon the 
head lower than one-half the distance from the first spine of 
the dorsal to the end of the snout. The forehead is slightly 
concave, as in Emb. Jacksoni. The posterior end of the in- 
termaxillary does not extend as far back as the anterior bor- 
der of the orbit. The nature of the lips, and extent of the 
upper maxillary, is much as in the other species, but the an- 
terior edge of the socket of the intermaxillaries is above the 
line of the lower border of the orbit. A vertical line through 
the orbit shows the height of the head in this region to be 
one-third less than in the E. Jacksoni. The opening of the 
mouth is directed more obliquely upwards. The teeth are 
more slender, but have otherwise the same form. In the 
upper jaw there are twelve, in the lower eight, teeth. The 
nasal openings are of tolerable size ; one before the other, 
and in advance of the eye, but slightly below the line of its 
superior border. The vertical diameter of the orbit is less 
than its longitudinal ; and its posterior border is nearer the 
angle of the opercle than the snout. The preopercle in this 
Species is less rectangular than in the former. The inferior 
rounded angle ofits ridge is in advance of the posterior mar- 
gin of the orbit. The scales of the preopercle are also much 
smaller and less conspicuous. ‘Tubes radiate from the bor- 
der of the orbit and from the ridge of the preopercle, as in 
Emb. Jacksoni. The posterior membranous border of the 
opercle is narrower; the notch between the subopercle and 
interopercle is on the vertical line of the posterior border of 
the preopercle. There is a patch of scales above the supe- 
rior attachment of the preopercle. The dorsal fin differs 
very little in form from that of the former, but extends some- 
what farther forwards, its first spine being immediately over 
the posterior angle of the opercle. The distance from this 
spine to the end of the snout equals the distance from the 
same back to the ninth articulated ray. The posterior rays 
