OF NEW ZEALAND. 69 
wanting in both of the specimens in the Museum. Length of carapace 
to tip of rostrum 2 in. 
Auckland Islands, Rendezvous Cove (Coll. Brit. Mus.). 
I think it quite possible that the Grimothea gregaria, Leach, very 
common at the Falklands and in the Straits of Magellan, is the 
immature condition of M. sub-rugosa. The only difference of any 
importance between them consists in the elongated foliaceous external 
maxillipeds of G. greyaria, on which Leach established the genus 
Grimothea, and it is also a much smaller species. But in a large 
series of specimens in the National Collection, named, I think rightly, 
by Dr. Cunningham J. sub-rugosa, and obvained at various points at 
the Southern extremity of the American continent, there is consider- 
able variation in the length of the external maxillipeds. On the other 
hand, specimens agreeing with G. gregaria in all respects have just 
been received by the British Museum from New Zealand. I have not 
however been enabled to observe a complete gradation between the two 
species. The hands in G. gregaria are granulous, in JZ, sub-rugosa 
they are usually spinulous. 
Tribe. WI. MACROURA. 
Macroura, Latr. (part) Fam. Nat. p. 274, (1825). 
Macroures, M. Edw. (part) Hist. Nat. Crust. 1, p. 247, (18384). 
Macroura, Dana, U.S. Explor. Exped. sin, Crust. part i, p. 497, 
(1852). 
Abdomen elongate, extended backward, with lamellar appendages 
beneath. Appendages to the penultimat: segment large, laterally 
expanded, and constituting, with the terminal segment, a fan-like 
swimming apparatus. 
Sternum usually linear throughout its lenyth, Antenne very greatly 
developed, inner without fossettes. External maxillipeds nearly always 
pediform. Buccal cavity not distinctly defined in front. 
Sub-Tribe I. THALASSINIDEA, 
Thalassiniens, M. Edw. Hist. Nat. Crust. ii, p. 303, (1837). 
Thalassinidea, Dana, U.S. Explor. Exped. xii, Crust. part i, p. 500, 
1852). 
