S. J. >Si)iith — 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, but extending only a short 

 distance from the median line. The whole posterolateral 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 I), 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 neai'ly 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 poi-tions 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 

 J). Rathkii. The three last segments in fact resemble the correspond- 

 ing parts of IJ. Ratkkli much more nearly than those of D. sculjytus. 



The antennae and the three pairs of maxillipeds are almost exactly 

 as in I), 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 I), sculptus, l)ut the proportions of 

 the segments are difterent, 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 seta?. The 

 carpus is very slender, longer than the combined lengths of the 

 merus, propodiis and dactylus, and naked except a few short hairs 

 on the outer side and a group of slender setae 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 D. sculptus, but the carpal seg- 

 ments are only about three-fourths as long as the meral. 



The abdomen, to the tip of the telson, is only slightly longer than 

 the cephalothorax, and all the segments, excej)t the telson, have very 

 nearly the same form and proportions as in D. 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 



