100 MR. F. E. BEDDARD ON ISOPODA COLLECTED [Feb. 2, 
the thoracic appendages are slender and not greatly elongated ; they 
terminate in a single claw; the first pair are subcheliform. The 
uropoda are rudimentary, consisting of only a single conical setose 
joint. 
1. ASTRURUS CRUCICAUDA, N. sp. 
This species is represented by a large number of individuals 
dredged in shallow water off Kerguelen ; the largest individuals only 
measure 4 or 5 millim. in length. 
The body is more or less pear-shaped, the anterior region of the 
thorax being wider than the posterior. The head is narrower than the 
succeeding segment of the thorax ; it is prolonged anteriorly into two 
long slightly divergent processes, each of which is as long as the 
head itself ; laterally is a longish process on either side, which 
terminates in a slightly swollen extremity ; ; these processes resemble 
the eye-stalks in Munna, and they contained some orange-coloured 
pigment in the interior, but no recognizable trace of lenses ; the 
surface, moreover, is covered with numerous short spines like the rest 
of the body. The four anterior thoracic segments are of nearly 
equal length, but they increase in width up to the third; the median 
region of these segments is convex and densely covered with short 
spines; the lateral margins are prolonged into long stout spines, 
which are themselves covered with short spines like the thoracic 
segments and the rest of the body. The three posterior segments 
are all much shorter than the fourth segment, and decrease gradually 
in length; their lateral margins are without the greatly elongated 
spines of the anterior segments ; only on the fifth and sixth segments 
oue of the spines which fringe the body is rather more elongated than 
the rest. The abdominal shield is oval, tapering posteriorly ; it termi- 
nates in four somewhat flattened spines arranged in the form of a 
cross. The antennules consist of a two-jointed peduncle and a five- 
or six-jointed flagellum ; the proximal joint of the peduncle is 
broader and shorter than the succeeding joint. The antenne are 
not so long as the body but considerably longer than the antennules ; 
the two proximal joints of the peduncle are elongated, the flagellum 
is shorter than either of these. The mandibles have a three-jointed 
palp. The first pair of thoracic appendages are modified into a 
prehensile limb; the remaining thoracic appendages are slender and 
elongated, particularly the three posterior pairs. The wropoda are 
rudimentary as in Munna. 
Kerguelen, 120 fathoms. 
Neraseuuus, F. E. B. 
Neusellus, F. E. Beddard, Narr. Chall. Exp. vol. i. p. 882. 
fir. 326. 
This new genus is represented by a single species from Kerguelen. 
It comes near to Pleurogonium and Leptaspidia, but is distinguished 
by the great horizontal elongation of the head, which is as wide 
as the following segment and bears the antennary organs at the 
