CRUSTACEA 293 
however, that in all these specimens the chelipeds were of 
moderate length and not greatly elongated as in the large 
Australian males, the types of the species, in the British 
Museum; and he suggests that the differences may perhaps be 
found to be of specific importance. At the time he wrote he 
was evidently unacquainted with Filhol’s description of 
O. huttoni. 
Through the kindness of the authorities of the Portobello Fish 
Hatchery I have been able to examine two other female 
specimens and one male. In the latter the chelipeds are greatly 
elongated as in the Australian specimens referred to by Miers, 
and there can, therefore, I think, be little doubt that our New 
Zealand ‘species is really the same as the one found in Australian 
seas. 
In this male specimen the total width of the carapace to the 
tips of the lateral spines is 42mm., and the eye stalk reaches 
almost to the end of the spines, the chelipeds are greatly 
elongated, the merus being 35mm. long and the total length of 
the propod to the end of the fixed finger 47mm., the carpus is 
quite short, only 7mm. long; the merus has the under surface 
somewhat flattened, but otherwise is nearly cylindrical, and of 
approximately the same width throughout. It bears no spines, 
even the one on the middle of the posterior margin being quite 
absent, but along the lower inner angle there is a series of fairly 
well-marked granules, and other granules are present along the 
upper surface, while the other surfaces are smoother, being only 
minutely granulated. The propod is granulated in the same 
way, the granulations beg most evident along the upper 
surface. It is rounded in section at the proximal end but widens 
considerably to the bases of the fingers where it is a good deal 
compressed. The dactyl is granular on its upper edge; its inner 
edge, like that of the fixed finger, bears a number of rounded 
teeth of various sizes. 
HALICARCINUS PLANATUS Var. TRIDENTATUS (Jacquinot et Lucas). 
Hymenosoma tridentatum Jacq. et Luc., Voy. au Pole Sud., i11., 
1853. ps OOMpl vy. Hes 2i. 
H. tridentatus Filhol, Mission de 1’Ile Campbell, 1885, p. 396. 
H. planatus, var. tridentatus Chilton, Subant. Is. N.Z., 1909, 
. 609. 
Pein conta specimen from the Chatham Islands appears to 
belong to this common species. There is also a large male 
specimen from Station 6, off Stewart Island. 
As explained under the reference last quoted, I look upon this 
form as a variety of the widely distributed sub-antarctic species 
H. planatus (Fabr.). 
