THE COPENHAGEX MUSEUM A^■D OTHEK SOUECES. 413 



but I feel convinced that his figures and description refer to the male sex. Tlie hirsute 

 second anteunte and the great ditFerence in the size of the two pairs of gnathopods are 

 strong evidence of this. 



Allorchestes humilis Dana. (Plate 33 D.) 



1852. Allorcliestes humilis Dana, P. Aiuer. Ac. vol. ii. p. 2()(). 



1853. „ „ Dana, U.S. Expl. Exp. vol. xiii. p. 890, pi. 60. fij;. 6 a-e. 

 1862. „ „ Bate. Catal. Anipli. Biit. Mus. p. 45, pi. 7. fig. 5. 



1893. ? Ill/ale Prevostii, ? , Delia Valle, F. u. Fl. G. Neapel, Mon. 20, Ganimarini, p. 528. 



Eyes. A little oblong, according to Dana. In Saghalien specimens, small, round, 

 light-coloured. 



First antennce. A little shorter than the second pair ; the peduncle two-thirds as long 

 as the peduncle of the following pair; the flagellum containing from six to eight joints, 

 which are very distinct, with moniliform appearance, and long filaments on the widened 

 apices. 



Second aiiteiDice. About one-third tlie length of the body ; the last two joints of the 

 peduncle subequal; the flagellum containing nine to ten joints, which are not very long 

 nor distally widened ; the seta; being in Dana's account all very short, but not very short 

 in Saghalien specimens. 



First moxillce. The palp reaches the base of the spines of the outer plate. 



MaxilHpeds. The third joint of the palp is said by Dana to be narrow, nor is it wide 

 in the Saghalien specimens ; but this joint often looks mvich narrower than it is, unless 

 specially flattened for examination. 



First gnathopods. The fifth joint is scarcely longer than broad ; the sixth is much 

 longer, oblong, widening to the oblique, spinulose palm, which is shorter than the spinu- 

 liferous hind margin, and has a strong palmar spine. 



Second giuithopods. These are very similar to the first pair, and the sixth joint, though 

 considerably, is not exorbitantly larger ; the fourth joint has the hind margin somewhat 

 produced, which is not the case in the first pair ; the fifth has a narrower hind lobe ; the 

 sixth is oblong oval, the closely- fringed palm more oblique, and subequal to the hind 

 mai'giu, which carries two groups of spinules. The finger, according to Dana, is " curved 

 and short, and shuts close against " the palm ; in the Saghalien specimens its outer 

 margin is strongly convex, and the inner, which matches the palm, carries six minute 

 setules. 



Fencopods. These are moderately stout, tlie finger curved, with the usual setule on 

 the inner margin. In the last three pairs the second joint is nearly orbicular, with the 

 hind margin slightly crenulate. In the Saghalien specimens the branchial vesicles are 

 narrow at the base, then becoming inflated. 



Third uropods. These are very short. In the Saghalien specimens the ramus is as 

 long as the peduncle, each carrying apical spines. 



Telson. This is not mentioned by Dana. It is short, divided beyond the middle, but 

 not to the base, each half as broad as long; the apices are divergent, truncate, tipped 

 with spinules. 



57* 



