Cuitton.— Additions to the New Zealand Crustacea. 173 
two following, and having the hand stout and ovate, and the finger long 
and curved; the second and third pairs similar in shape and equal in size ; 
the four posterior pairs are all nearly equal to one another, and are non- 
chelate. First five abdominal segments confluent; the last segment has 
its posterior edge notched at the centre. Its appendages are broad, oper- 
culiform, and biramous, the inner branch formed of a single joint, broad 
and concave, enclosing the other branch, which has two broad joints, the 
basal one being much longer than the terminal joint. The terminal segment 
(telson) squamiform, rectangular, with the posterior angles rounded. The 
posterior edges of the telson and of the appendages of the last abdominal 
Segment are fringed with numerous long sete. Length, °3 in. 
Hab. Among seaweed in rock-pools, Lyttelton Harbour. 
This species differs from Anthura in that the first five (instead of four) 
abdominal segments are confluent and that the inner antenna has a distinct 
flagellum, but as I have only a single specimen I have not made a new 
genus for it. 
AMPHIPODA. 
Microdentopus maculatus, G. M. Thomson (Ann. & Mag. N.H., ser. v., 
vol. iv., p. 381). 
This species was described by Mr. Thomson, from a single specimen, a 
female. It appears to be moderately common amongst seaweed in the 
tock-pools at Lyttelton. Amongst some specimens answering very well to 
his description I took one which also agreed with that description in every 
particular except as regards the gnathopoda. These (plate VIIL., fig. 3) are 
very peculiar, the meros is produced inferiorly into a long acute spine 
reaching slightly beyond the extremity of the succeeding joint, the earpus; 
is spine bears a small tuft of sets about one-third of its length from its 
extremity. The carpus is large, and is rather more than twice as long as 
broad, The propodos is much smaller; its inner edge is fringed with 
numerous sete. The last joint forms a strong finger slightly curved at the 
end, its inner edge is smooth; numerous long sete arise at its base. The 
second pair of gnathopoda are of more normal shape, the meros not being 
produced into a spine. 
The first pair of gnathopoda closely resemble those of Aora gracilis and 
Aora typica,* though slightly different from both of them. Mr. Thomson 
has taken dora typica in Dunedin Harbour, and he speakst of its resem- 
blance to Microdentopus maculatus, and hints that they may possibly be 
male and female of the same species. The animal I have, though distinct 
PRS aren 
* “ Brit. Mus. Cat. Amphip. Crust.,” pp. 160-2, pl. xxix., figs. 7 and 8, 
t “Trans, N.Z. Inst.,” vol. xiii., p. 218. 
