G. M. Tuousox.—ÓOn new Crustaceans. 235 
Fam. IDOTEIDA. 
Genus Edotia, Guérin-Méneville. 
1. Edotia dilatata, n.sp. Pl. xii., figs. 9, 10. 
Female.—Body somewhat flattened and much dilated in the middle, the 
second, third and fourth segments being progressively broader and bluntly 
angled at the sides, fifth suddenly narrowing to less than half the width of 
the fourth ; epimera completely amalgamated with the thoracic segments. 
Post-abdomen 2-jointed, the 1st joint very short, 2nd greatly elongated ; 
distal extremity somewhat excavate. 
Head subquadrate, with the anterior margin nearly straight, posterior 
slightly rounded. Antennules (internal antenne) very short, 4-jointed, 
basal joint stout. Antenne (external antenne?) reaching to the second 
thoracic segment, flagellum 18-14-jointed. Legs slender, subequal, dactyla 
of all the feet double-clawed (terminal and sub-terminal claws subequal). 
Opercular plates elongated, narrow ; distal portions sub-quadrate, their 
extremities terminating in a point on the inner line, rounded outwardly. 
The whole body is of a light chestnut-brown colour, and the surface is quite 
smooth; the abdomen bears numerous minute black dots. Length about 
linch. The whole under-surface was occupied by an ovigerous pouch. 
This is a remarkable species intermediate in many respects between 
Edotia and Idotea, though apparently on the whole nearest to the former. 
It differs however from the characters of the genus in which I have placed 
it, in wanting the characteristic oblique line across the basal opercular 
plates. From /dotea it differs most conspicuously in having the epimers 
anchylosed with the sides of the thoracic segments. The ova in the oviger- 
ous pouch were not sufficiently developed to furnish any characters. 
A single specimen was sent to me from Auckland by T. F. Cheese- 
man, Esq. 
Fam. ORCHESTIDA. 
Genus Allorchestes. 
Allorchestes recens, n. 8p. Pl. xiii., figs. 2-5. 
Body tolerably compressed and slender, quite smooth ; coxal plates of 
the first three thoracic segments about as deep as their respective segments ; 
those of the rest of pereion shallower. Eyes rather small, nearly circular. 
Superior antenn® reaching to or slightly beyond the extremity of the 
peduncle of the inferior; peduncle about as long as the 5-7-jointed 
flagellum. Inferior antenne about one-fourth as long 8$ the body ; 
peduncle about equal with the 8-10-jointed flagellum. In both antenne 
a few very short stiff sete are found at the extremity of each joint. The 
maxillipedes have an extremely short and pointed dactylos ; most of the 
joints have numerous short stiff sete at their extremities and inner 
