CRUSTACEA 289 
PARAMITHRAX LONGIPES G. M. Thomson. 
Plate LVII. 
~Paramithrax longipes G. M. Thomson, Ann. and Mag. Nat. 
Hist.,:ser. 7, vol. x., 1902, p. 361. 
Numerous specimens of this species were taken at Stations 
4, 5, 7, 17, 23, and 26. They agree well with the description 
given by Mr. G. M. Thomson, except that in most cases the 
carapace is more spiny than is shown in his figure. Dimensions 
of largest male, length of carapace 80mm., breadth 60mm.: 
propod of cheliped, 60mm. 
Nearly all the specimens have the carapace overgrown and 
sometimes almost completely covered with sponges, compound 
ascidians, Serpulw, Spirorbis, and particularly with Balanus 
decorus. On one small female specimen there were nine or ten 
specimens of Balanus decorus, the whole of them together being 
larger than the body of the crab; another, a male, bore five 
specimens of this species on its back, and numerous other 
examples bore one or more large specimens of Balanus 
decorus. It thus appears that there must be some special 
association between the crab and this species of cirripede. (See 
Pl. lvin, figs, 1, -2):3). 
From Station 30 I have one mutilated male specimen measuring 
30mm. from the tip of the rostral spines to the posterior end 
of the carapace, which already has the characteristic external 
maxillipeds, and undoubtedly belongs to this species; the spines 
on it are however very much more prominent and acute than 
those described and figured by Mr. Thomson—his figure appears 
to have been taken from an old specimen in which the spines 
have become reduced to tubercles. In the immature specimen 
the four spines in the branchial region are particularly sharp 
and prominent, the two posterior ones being the largest, the 
posterior margin of the carapace is produced in the median line 
into a prominent spine of about the same size and there is a 
well-marked row of four spines anterior to this in the median 
line; the rostral spines project almost horizontally while in the 
larger specimens they are somewhat depressed towards their 
extremities. 
PARAMITHRAX LATREILLEI Miers. 
Paramithraz latreille: Miers, Cat. N.Z. Crust., 1876, p. 6. 
P. barbicornis Miers, ib. p. 6 (not of Latreille). 
Hutton, Index Faune N.Z., 1904, p. 247. 
P. cristatus Filhol, Mission de Vile Campbell, 1885, p. 358, pl. 
xli., fig. 11. 
Lenz, Zool. Jahrb., xiv., heft 5, 1901, p. 454. 
