390 Prof. Agassiz on Viviparous Fishes from California. 
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 of its 
ridge is in advance of the posterior margin of the orbit. The 
scales of the preopercle are also much smaller and less conspicu- 
ous. Tubes radiate from the border of the orbit and from the 
ridge of the preopercle, as in Emb. Jacksoni. The posterior mem- 
branous 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 
superior attachment of the preopercle. The dorsal fin differs very 
little in form from that of the former, but extends somewhat far- 
ther forwards, its first spine being immediately over the posterior 
angle of the opercle. The distance from this spine to the end o 
the snout equals the distance from the same back to the ninth ar- 
ticulated ray. ‘The posterior rays of the articulated portion, are 
shorter than in the first species, but they are more numerous by 
three rays. The pectoral has twenty-one rays; it is perhaps longer 
than in the other. The ventrals differ little. The anal fin how- 
ever, differs greatly : it is very small and contracted, and is placed 
far behind the ventrals. The scales at its base form a waved out- 
line much more marked than in E. Jacksoni. The spinous rays 
are very short, the last being less than one half the length of the 
following articulated ray, the base of which latter is directly un- 
der that of the fifteenth corresponding ray of the dorsal fin. _ Its 
posterior base and termination are as in the first species. The 
Color light olive, darker along the back ; light brown Iongi- 
tudinal bands extend between the rows of scales, and darker trans- 
verse bands reach from the back to the sides of the body, not ex- 
tending below the lateral line in the anterior part of the trunk, 
with black and white. Anal with a large diffuse black mark 
upon lighter ground. Peetorals white. Ventrals white at the 
base, terminated with black. 
Only one female has been observed, containing eight young. 
This species was discovered by T. ary in 
: the Bay of 
San Francisco, in the beginning of August 1853. 
