S. T. Smith — Crustaceans of the Atlantic Coast. 
119 
the side of the median lobe of the carapax ; the second extends from 
the inferior margin a little back of the first to the dorsal line at the 
back of the median lobe ; the third and fourth extend from the infe- 
rior margin to the dorsal line, the fourth nearly touching the posterior 
margin above. The minor flagellum of the antenula is only a little 
longer than the proximal segment of the major flagellum. The car- 
pus in the first pair of pereopods reaches very nearly to a line with 
the front of the carapax, and the carpus, propodus and dactylus are 
sub-equal in length. The second pereopods do not quite reach a line 
with the front, the dactylus and propodus are about equal in length 
and together about equal to the length of the carpus, which is very 
slightly longer than the merus. The rudimentary exopods of the 
third and fourth pereopods have three or four plumose setae at the 
tip and several more upon the proximal segment. The basal portion 
of the uropods is as long as the telson and armed with about ten 
spines upon the inner margin : the inner ramus is about as lon«- as 
the basal portion ; the first segment is longer than the second and 
third together and is armed with about sixteen spines on the inner 
and two or three on the distal part of the outer margin ; the second 
with four or five spines on the inner margin and one at the distal 
extremity of the outer; the third or terminal with two upon the 
inner margin and three at the tip: the outer ramus is a little shorter 
than the inner and its two segments are sub-equal in length. The 
telson is as long as the fifth segment of the abdomen and about twice 
as long as the sixth segment, and is armed with either two or three 
spines upon the distal portion of each lateral margin and at the tip 
with five spines of about the same size as the marginal ones, though 
the median is a little larger than the others. 
Length 9 mm . 
Smaller, immature females differ in having the anterior pairs of 
pereopods proportionally shorter than in the adult, and in having 
fewer spines on the uropods. 
The only male seen is about 8£ mm long and not fully mature, 
although the antennae are as long as the cephalothorax and the 
exopods of the third and fourth pairs of pereopods are fully developed, 
but there is no indication whatever of rudimentary pleopods. From 
this fact it seems probable that the adult male is wholly without 
pleopods, and that this species represents a genus distinct from 
Lampro])8. 
I have seen only the male just referred to, one female with eggs 
and a few immature females. Gloucester Harbor!, Massachusetts, 7 
