BULLETIN OF THE 
Zithusa pubescens, sp. nov. 
Carapace a little broader than long, densely pubescent; frontal margin 
ciliated ; cardiac area open in front, the branchio-cardiac lines not meeting one 
another in the median line; front four-toothed, the median teeth more widely, 
but less deeply, separated from each other than from the lateral; the antero- 
lateral angles reach the level of the frontal teeth. Eyes as in the last described 
species (Æ. ciliatifrons), Chelipeds equal, small, with pubescent merus and 
naked carpus and hand ; fingers longer than palm, compressed, curved, gaping 
at base. Ambulatory*s pendages similar to those of Æ. ciliatifrons, but free 
from granulation. Abdomen (of female) very broad, pubescent. 
Length, 26 mm.; breadth, 29 mm. 
Station 3367. 100 fathoms. 1 female. 
This species resembles Æ. ciliatifrons, but the median notch of the front forms 
a more open angle in Æ. pubescens, and the sinus separating the front from the 
external orbital angle is not so deep. The branchio-cardiac lines do not meet 
in front of the cardiac area, and the cardiac area is not so much sunken below 
the level of the branchial regions ; the branchial areas, moreover, are not so 
conyex, nor is the cardiac region so uneven. The whole surface is densely 
pubescent, and the abdomen of the female is much broader. The fingers too 
are different, inasmuch as they are separated by quite an interval at base. 
The first and second pairs of ambulatory limbs are imperfect in the only 
specimen at hand, but they are very similar, as far as they go, to the corre- 
sponding appendages of Æ. ciliatifrons. 
Ai. pubescens may prove to be the full-grown state of Æ. lata Rathbun, the 
description of which has just appeared in Proc. U.S. Nat. Mus., Vol. XVI, 
p. 258, 1893. 
Aithusina smithiana, sp. nov. 
In this species the carapace is longer than broad, and is not much nar- 
rowed anteriorly. The front is four-toothed, the middle pair of teeth large, 
triangular, separated from one another by a wide triangular sinus which is 
broader than the antennular sinus; between these teeth the margin is bent, 
down. till it meets the epistoma below ; the lateral teeth of the front are 
spiniform and shorter than the middle teeth. The surface of the carapace 
is clothed with a short pubescence, and is lightly granulous; the branchio- 
cardiac grooves are well marked. The post-orbital teeth are spiniform, and 
they project far beyond the extremity of the small eyestalks. The eyes are 
smaller than the extremity of their peduncles. The chelipeds are equal, 
smooth, naked, unarmed ; the merus cylindrical, the carpus short and rounded : 
the fingers about equal in length to the body of the chela, compressed, prehen- 
sile edges sharp and not provided with distinct teeth or tubercles, The 
ambulatory legs are nearly naked, the second pair more than twice the length 
