118 
S. I. Smith — Crustaceans of the Atlantic Coast. 
longer than the sixth segment of the abdomen, and is furnished with 
a series of long set* on the inner margin. The inner ramus is much 
longer than the base ; of its two segments the proximal is much the 
longeqand is armed with six to eight stout spines on the inner margin 
and with three to five much more slender spines on the outer; the 
distal segment terminates in a very long and stout spiniform tip, at 
the base of which there is a long seta on the outside, and upon the 
inner edge about three spines like those upon the proximal segment. 
The outer ramus is slightly longer than the inner, tapering, and 
slightly curved outward at the tip, armed along the inner edge and 
at the tip with a few long set*, and on the outer edge and above with 
a few set* near the middle. 
The adult males differ from the females as usual in the genus. The 
carapax is not as high posteriorly, the lateral margin is more nearly 
straight, not denticulate anteriorly, the anterior angle rounded, and 
the frontal margin is very nearly straight throughout. The major 
flagellum of the antennul* shows distinctly four segments. The 
uropods are similar to those of the female, but very much more elon- 
gated and armed with more numerous and longer spines and set*, both 
of which are, as usual, plumose. The set* which are so conspicuous 
upon the posterior margin of the terminal segment of the abdomen 
of the female, appear to be wholly absent in the male. 
Length of adult females, about 5 mm ; males a very little longer. 
Off Halifax!, Nova Scotia, 1877: females carrying eggs common, 
42 fathoms, fine sand, and 52 fathoms, sandy mud; also two females 
from 57 fathoms, stones, sponges and red alg*. About thirty miles 
south of Halifax!, 110 fathoms, fine sandy mud. Gulf of St. 
Lawrence!, 1873 (J. F. Whiteaves) : both males and females, south 
of the eastern part of Prince Edward Island, and in 70 fathoms, off' 
the Bay of Chaleurs. 
Lamprops quadriplicata, sp. now 
Female. The cephalothorax is as long as the abdomen exclusive 
of the telson. The carapax is about as long as the first four of the 
free segments, and, as seen in a side view, very slightly arcuate 
dorsally, the front truncated above and with a slight sinus in the 
frontal margin below it, leaving the antero-inferior angle slightly pro- 
jecting, but obtuse and evenly rounded, and in most of the specimens 
armed with three or four very minute teeth. On each side of the car- 
apax there are four, very distinct, arcuate and nearly parallel plications, 
of which the first is short and extends from the antero-inferior angle to 
