Cuir ton.— Additions to the New Zealand Crustacea. 69 
Art. IL— Further Additions to our Knowledge of the New Zealand Crustacea. 
By Onanrzs Cuinros, M.A. 
[Read before the Philosophical Institute of Canterbury, 7th September, 1882.] 
Plates I.—III. 
BRACHYURA. 
Hymenosoma lacustris. 
Elamena (?) lacustris, Chilton. (Trans. N.Z. Inst., vol. xiv., p. 172.) 
Tas species was described from a single specimen, a female. I have since, 
through the kindness of Professor Hutton, received seven others, all males, so 
that I am now able to describe it more fully and to refer it to its proper genus. 
In the Catalogue of the Stalk- and Sessile-eyed Crustacea of Australia 
Mr. Haswell has replaced the genera Hymenicus and Halicarcinus by 
Leach’s original genus Hymenosoma; and my species will also come under 
this genus as it is defined in Mr. Haswells catalogue. Its name will 
therefore be Hymenosoma lacustris. 
Specific description :—Carapace nearly circular, rather broader than 
long; flat, naked, or with a few scattered hairs. Rostrum broad, strongly 
depressed, its upper surface concave from side to side, extremity in the 
form of an obtuse angle. Antero-lateral margins of the carapace with two 
obscure teeth. Chelw of male small, propodos only slightly broader than 
the carpus, hairy. Ambulatory legs somewhat densely covered with long 
hairs, tarsi long, slender, compressed, densely-haired. Last pair of legs 
somewhat shorter than the preceding. Abdomen of male of five joints 
subequal in length, third rather narrower than the first and second, fourth 
nearly as wide as the third, last broadly rounded at the end; margin 
fringed with very short hairs, some longer ones being scattered on the sur- 
face. Abdomen of female with a slight median ridge along its whole length. 
Hab. Lake Pupuke. (Fresh water.) 
The hairs on the legs and carapace appear to be somewhat variable. 
The third (external) maxillipedes are shown in pl. I., fig. 2 a. On them 
are found sete of several kinds ranging from the ordinary plumose setze (c) 
to others strongly serrated on each side (b). ` 
This species is remarkably near Hymenosoma australe, Haswell, from Port 
Phillip. From this, however, it differs in the chelæ of the male which are 
small, while in H. australe they are “ extremely large." 
ISOPODA 
Genus Scutuloidea, (novum). 
Generic description :—Body not very convex. Pereion much broader 
than the cephalon, increasing regularly in breadth up to the fourth segment 
and then decreasing again. 
