OF NEW ZEALAND. 93 
97. Idotea affinis. 
Idotea affinis, M. Edw. Hist. Nat. Crust. iii, p. 133, (1840). 
? Idotea nitida, Heller, Voy. Novara, Crust. p. 131, pl. xii, fig. 1, 
(1865). 
Thorax narrow, oblong, convex, with the segments of nearly equal 
width throughout, first three segments with the anterior and posterior 
lateral angles somewhat produced and rounded, epimeral pieces oblong, 
rather narrow. Antenne reaching usually to the posterior margin of 
the third thoracic segment, with the two last joints of the peduncle 
subequal, longer than the preceding, flagellum with about twenty joints. 
Abdomen two-jointed, second joint incised on the sides, terminal joint 
long, with the posterior margin concave, the lateral angles acute or 
obtuse. Length 12? in.; breadth 3 in. (H.). 
New Zealand; Auckland (Coll. Brit. Mus.). 
This species varies slightly in the number of the joints of the 
external antennz, and the more or less acute latero-posterior angles of 
the last abdominal segment. The specimens in the British Museum 
seem toa certain degree intermediate between J. affinis, M. Edw., as 
described by Heller, from the Cape, and J. nitida from St. Paul Island, 
98. Idotea elongata. Pl. II, fig. 3. 
Idotea elongata, List. Crust. Brit. Mus. p. 95, (1847), sine deser. ; 
Miers, Ann. Mag. Nat. Hist. (ser. 4) xvii, p. 225, (1876) 
Elongate-linear, regularly rounded, so as to appear cylindrical from 
above. Segments of thorax longer than broad, with the epimeral 
pieces in a lateral view very narrow-linear, and coalescent with the 
thoracic segments, the lines of union indicated by sutures on the sides, 
beneath greatly developed, and sheathing the base of the legs. Head 
usually coalescent with the first thoracic segment. Antenne as in 
I. affinis, flagella about 22-jointed, terminal segment of the abdomen 
with a rather deep rounded excavation at its extremity, the latero- 
posterior angles rounded. Length 13 in.; breadth not } in. 
Auckland Islands (Coll. Brit. Mus. ). 
This species is distinguished by its much narrower, more convex 
body ; the longer thoracic segments, and the much narrower epimerz, 
which are linear in a lateral view, 
