OF NEW ZEALAND. 31 
in the middle of the posterior margin. Wrist with two spines, one on 
the inner, the other on the outer surface. Hand slightly carinate, 
with a short spine above the base of the mobile finger. Mobile finger 
with four or five small acute spines on its upper margin. Following 
legs slender, somewhat elongate. Fifth pair of legs with the thigh 
short and wide, the penultimate joint flattened, the last joint oval and 
lamellate. Colour, ferruginous-brown. Length 13 in.; breadth 22 in. 
(A. M. E.). 
Auckland Islands (Coll. Mus. Paris); New Zealand (Coll. Brit. 
Mus. ). 
Family IV. PLATYONYCHIDZ. 
Portuniens, M. Edw. (part) Hist. Nat. Crust. i, p. 452, (1834); A. 
M. Edw. Archiv. Mus. Hist. Nat. x, p. 309, (1861). 
Platyonychide, Dana, U.S. Explor. Exped. xii, Crust. part i, p. 290, 
(1852). 
Carapace rarely hexagonal, more or less rounded on the sides, often 
longer than broad. Teeth of the antero-lateral margins well defined, 
acute. Inner ramus of the first pair of maxillipeds simple. Abdomen 
narrow at base. Margin of the efferent branchial channel not defined 
by a longitudinal ridge on each side of the prelabial plate or palate, 
Fifth pair of legs natatorial, their terminal joint oval, expanded, and 
lamellate. 
PLATYONYCHUS. 
Platyonychus, Latr. (part) Encycl. Méth. x, p. 151, (1825); M. Edw. 
(part) Hist. Nat. Crust. i, p. 435, (1884); A. M. Edw. (part) Archiy. 
Mus. Hist. Nat. x, p. 410, (1861); Bell, Brit. Crust. p. 83, (1853) ; 
Miers, Zool. Erebus and Terror, Crust. p. 2, (1874). 
Carapace broader than long, smooth above, antero-lateral margins 
regularly five-toothed. Front, narrow, dentate, and not produced 
beyond the level of the external orbital angle. Orbits wide, with a 
large internal hiatus. Fossettes of the inner antenne small, and imper 
fectly defined. Basal joint of the external antenne small, and not 
occupying the whole of the inner orbital hiatus. External maxillipeds 
very large. Anterior legs large, the hands long, costate externally. 
Next three pairs of legs with the tarsi lanceolate, compressed. 
Posterior legs with the last joint oval, broad, rounded at the extremity. 
