160 
RECORDS OF THE AUSTRALIAN MUSEUM. 
The sixth segment has superiorly a faint longitudinal mesial 
groove, and two pairs of submedian tubercles ; the anterior pair 
are separated by the groove, the posterior pair are much wider 
apart and nearer the hinder margin ; the latter bear about eight 
tubercles, four on each side of a short central ridge. 
The uropods and telson have the basal third calcified. The 
superior distal margin of the outer ramus has eight small denticles, 
and that of the inner ramus two or three situated on the outer 
fourth. 
The telson is marked by four smooth pit-like depressions, the 
anterior pair are wide apart and seated on the base, the posterior 
pair are large, submedian, and occupy the distal half of the calci- 
fied part. The membraneous laminae of the uropods and telson 
have numerous radiating ribs, which exhibit repeated dichotomous 
branching ; the ribs on both surfaces of the telson and on the outer 
halves of the rami are closely granulose. 
The pleopoda are biramous ; the first pair are wanting in both 
male and female. The second pair in the former are foliaceous 
and have the rami equal in length ; the outer one is broad at the 
base, and the inner one rather narrow. In the succeeding pairs 
the outer ramus is similar in shape to that of the second, but the 
rami decrease in size on each somite ; the inner ramus is 
represented by a short obtuse conical stump. It is interest- 
ing to note that the inner ramus of the fourth segment on 
the left side — in the male example under notice — is consider- 
ably developed, it is equal to the outer in length but is 
very narrow and styliform ; a small stylamblys occurs at its 
base. 
The second pair of pleopoda in the female are very large, and 
consist of foliaceus plates with strongly ciliated margins. The 
inner ramus is rather broader than the outer, and carries a single 
stylamblys tipped with long setae, to which the ova are attached. 
In the following pairs the lamina of the outer rami is much 
smaller than those of the second ; the inner ramus is narrow, 
elongate, and three-jointed ; a foliate plate arises from the outer 
base of the second joint. The margins of the joints and lamina 
are more or less fringed with long plumose hairs to which the 
bundles of ova are cemented. 
Basal joint of first antenna tuberculate, twice as long as broad, 
the inner distal angle terminating in a prominent denticle ; second 
joint stout, smooth, compressed, nearly twice as long as the first, 
and equal to the third ; fourth shorter than the latter, about twice 
as long as the outer flagellum. 
Outer antennas a little shorter than the inner. The basal joint 
is very large ; the inferior distal margin is denticulate, it carries 
