no 
S. I. Smith — Crustaceans of the Atlantic Coast . 
pairs of spines. The basal portions of the uropods are about a fourth 
longer than the telson, slender, and each armed along the distal three- 
fourths of the inner side with a series of ten to twelve small spines 
which become more scattered proximally and never extend to the base. 
The inner ramus is about two-thirds as long as the base, composed of 
two segments, slender, tapers to a long and slender spiniform tip, and 
is armed along the inner edge with eight to ten spines, of which four 
are usually upon the basal segment, and one, or sometimes two, upon 
the outer edge. The outer ramus is somewhat longer than the inner, 
slender, tipped with two long setifonn spines, and armed upon the 
outer edge with six to ten very slender spines, but with only a single 
spine upon the inner margin near the tip. 
The adult male differs from the female in being more slender, in 
having the cephalothorax much more compressed vertically, and, 
as usual in the genus, in the structure of the antennas, the anterior 
abdominal appendages, etc. The carapax is much more depressed 
than in the female, the height being less than half the length, and 
much broader and more obtuse anteriorly as seen from above. The 
surface is more conspicuously punctated than in the female, but the 
anterior portion is areolated in the same manner, except that there is 
in addition a prominent longitudinal carina-like crest each side, ex- 
tending in a straight line from the inferior margin just in front of the 
postero-lateral angle to the sharp curve at the lower end of the 
second vertical crest. The margin of the carapax below this is in- 
curved much more abruptly than in the female, so that the sides of 
the carapax are angulated each side at the widest part, — almost 
exactly as in the male of D. Rathkii. The telson is much longer 
than in the female, has the usual sharp dorsal angle between the 
basal and terminal portion, and is armed with eight to ten pairs of 
slender spines which are longer than in the female. The bases of the 
uropods are armed with ten to sixteen spines, and the inner edge of 
the inner ramus with twenty-four to thirty spines, of which ten to 
twelve are on the basal segment. 
This is a much larger species than V. scrdjytus, the length of the 
adult female, from tip of rostrum to extremity of telson, being about 
12 ram ; of adult male, about 14 ,nm . 
In life the males, at least, are semi-translucent, whitish, with the 
ophthalmic lobe pink. 
Vineyard Sound !, July *20, 1875, — one young male taken at the 
surface. Adult males were taken at the surface at the same locality, 
by Mr. Vinal N. Edwards, December 8, 1875, March ‘22, 1876, April, 
