S. I. Smith — Crustaceans of the Atlantic Coast. 
109 
part of this second vertical crest, there is each side a similar but less 
conspicuous crest parallel with the second, Imt extending only a short 
distance from the median line. The whole postero-lateral region of 
the carapax is unsculptured and nearly smooth. 
Of the five free segments of the cephalothorax, the first and second 
are nearly as in D. sculptus , except that the lateral expansion of the 
second segment, just above the attachment of the leg each side, pro- 
jects more abruptly and further anteriorly, so as to overlap the first 
segment and nearly reach the margin of the carapax. The third and 
fourth segments together are a little broader than the first and 
second, but the third is only about half as wide as the fourth and is 
closely consolidated with it above. The lateral portions of these 
segments are very much as in D. sculpta, except that the third seg- 
ment projects slightly forward, as well as backward, above the base 
of the leg each side. The fifth segment projects back each side and 
terminates in a slender spiniform process over the base of each leg as in 
D. Rathkii. The three last segments in fact resemble the correspond- 
ing parts of 1). Rathkii much more nearly than those of L>. sculptus. 
The antemue and the three pairs of maxillipeds are almost exactly 
as in b. sculptus. The first cephalothoracic legs are a little shorter 
than in that species, the distal end of the propodus only just about 
reaching to the tip of rostrum, but the relative lengths of the seg- 
ments themselves are about the same. The second legs are of about 
the same length relatively as in D. sculptus , but the proportions of 
the segments are different, the carpus being conspicuously long and 
slender. The stout curved basis is about as long as the merus and 
carpus combined, and is margined below with ciliated setie. The 
carpus is very slender, longer than the combined lengths of the 
merits, propodus and dactylus, and naked except a few short hairs 
on the outer side and a group of slender seta* at the distal extremity. 
The propodus and dactylus are correspondingly slender, the dactylus 
slightly the longer, and the combined length of the two segments is 
only slightly more than half the length of the carpus. The third, 
fourth and fifth legs are nearly as in 1). sculptus , but the carpal seg- 
ments are only about three-fourths as long as the literal. 
The abdomen, to the tip of the telson, is only slightly longer than 
the cephalothorax, and all the segments, except the telson, have very 
nearly the same form and proportions as in !>. sculptus. The telson 
is about as long as the fifth segment, broad at the base and abruptly 
narrowed to a slender terminal portion scarcely longer than the stout 
basal part, and the slender portion is armed with only six to nine 
