"s 
Fishes of Massachusetts. 419 
. To Dr. Yale I am indebted for a fine specimen of 
this Species, taken at Holmes Hole, which enables 
me to offer the accompanying description. Length 
fifteen inches; greatest depth one inch. Above, of 
alight green color; beneath, a clear silvery white, 
Just above the base of the pectorals, a deep blue 
band arises and passes in a straight line to the origin 
of the dorsal fin. Length of the head, from the an- 
gle of the jaws to. the posterior portion of the oper- 
culum, one inch six lines; flattened above, com- 
pressed on the sides. Length of the lower mandible, 
from the tip to the eyes. three inches five lines, and 
fleshy at its tip; three lines longer than the upper 
mandible; both mandibles armed with distant, very 
sharp, conical teeth, between which are numerous 
others, very minute; no teeth upon the upper man- 
dible, for the extent of two lines from its extremity. 
Eyes circular, three lines in diameter ; pupils black, 
irides silvery. Distance between the eyes about 
equal to the diameter of the eyes. éill-covers sil- 
very; at the posterior edge of the preoperculum, a 
vertical blue band, about four lines long. Imme- 
diately in front of the cyes, a triangular space, in 
which are situated the nostrils. 
The lateral line arises at the inferior angle of the 
operculum, and passing gradually up to the posterior 
extremities of the pectorals, assumes a straight line, 
Which is continued to the base of the caudal rays. 
The Dorsal fin is situated upon the posterior fourth 
of the body ; transparent, greenish, falciform, high 
anteriorly, very low posteriorly. 
The whitish Pectorals are directly back of, and 
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