S. I. Smith — Crustaceans of the Atlantic Coast. 
117 
The carapax, as seen in a side view, is about as long as the first four 
free segments, nearly three-fourths as high as long, with the dorsal 
margin approximately parallel with the posterior part of the lateral 
margins. Both the anterior and posterior portions of the lateral 
margin are nearly straight, but the anterior portion is directed up- 
ward at an angle very oblique to the posterior portion, from which it 
is separated by a broadly rounded angle. The anterior portion is 
obscurely denticulate posteriorly but distinctly, though very minutely, 
toward the slightly prominent anterior angle. The anterior margin 
is edentate and scarcely at all emarginate; below it is straight and 
nearly perpendicular, but curved considerably forward above, where 
the doi'sal or inner edges of the lateral lobes are turned abruptly 
upward at nearly a right angle just in front of the median lobe, to 
form, as it were, a dorso-frontal rostrum. There is a slight approach 
to this form of the antero-lateral lobes of the carapax in E. deformis , 
but in that species the dorsal edges of the lobes are prolonged and 
sharply upturned to form a slender dorsal horn in front of which the 
edges of the lobes are on a level with, and parallel to, the dorsum 
back of the horn ; while in this new species the whole lateral lobes 
are prolonged upward and terminate iu a slightly incurved edge 
nearly parallel with the posterior margin of the carapax. The ante- 
rior part of the carapax is in fact much as in some of the species of 
Leucon: if the rostrum in L. nasicoides were edentate and moi*e 
strongly upturned, it would represent very nearly the form of this 
part of the front iu the present species. 
The major flagellum of the antennula is much shorter than the 
terminal segment of the peduncle; the minor flagellum falls consider- 
ably short of the distal end of the first segment of the major flagel- 
lum, but is proportionally larger than iu M. deformis. The first 
pereopods are proportionally of about the same length as in E. 
deformis , the carpus reaching to or a little beyond a line with the 
front, and the segments are relatively of about the same length, but 
the terminal ones are more slender than in that species. The four 
posterior pairs of pereopods are distally a little more slender than in 
E. deformis , but do not differ essentially in other respects. 
The first five segments of the abdomen increase slightly in length 
posteriorly and are almost entirely naked, wanting wholly the 
plumose seta 1 conspicuous beneath the abdomen of E. deformis. The 
sixth segment is about as broad as long, the posterior margin evenly 
arcuated and armed in the middle with six, or sometimes only four, 
conspicuous seta*. The basal portion of the uropods is stout, scarcely 
