NEW TY.PE OP MALACOSTEACOUS CRUSTACEAN. 



9 



although not so large as in Anaspides. It is united to the body-segment without any 

 coxal plate or line of division. The second joint compared with Anaspides is formed 

 by the complete coalescence of two joints ; it is stout at the base, but narrows 

 considerably beyond the origin of a large and strongly developed swimming-exopod, the 

 peduncular joint of which is stout and carries a flagellum of about seven articles, each 

 bearing two long curved feathered setae. The third joint, corresponding to the fourth in 

 Anaspides, is narrower than the preceding one and of subquadrate form; the fourth of 

 equal length to the second and third combined ; the fifth is short, and it is apparent that 

 the articulation between the fourth and fifth is more flexile than any of the others ; the 

 sixth joint is nearly as long as the fourth, but narrower ; the seventh minute, and bearing 

 a row of three (not four as in the maxillipeds) closely-set stout claws, the middle one 

 being distinctly longer than the other two, which are equal to one another. All the 

 joints except the first are sparsely tufted with long seta?, some of which are faintly 

 feathered. 



The second, third, and fourth are so much like the first pair that nothing further need 

 be said of them, except that the fourth has the three last joints distinctly longer than the 

 preceding appendages. 



The fifth agrees closely with the preceding legs, but is not so long as the fourth. In 

 the female, in addition, there projects from the inner margin of the coxa a small lamellar 

 jobe fringed distally with incurved setae (fig. 16), close beside which is the opening of the 

 oviduct. The clothing is much like that of the preceding limb, and in addition there 

 js, on the distal inner margin of the fifth joint, a transverse row of five or more long 

 acute spinules, pectinated on each side for half their length, thence finely setose to the 

 apex (PI. 2. figs. 17 &17«). 



The sixth agrees in all respects with the fifth but has no exopodite, and the branchiae 

 are smaller ; the female also possesses a similar setose lamella on the inner side of the 

 coxa. 



The seventh is longer than the preceding limb and without any branchial lobes or 

 exopodite, neither are there any setose coxal lobes in the female. In other respects they 

 are alike. In the males the opening of the vas deferens is on the inner side of the first 

 joint. The female has a peculiar development arising from the sternum, in the median 

 region and a little in front of the legs ; it consists of two small closely approximated 

 ovoidal lamella?, widely attached at the base, and just behind these there is another 

 minute one, and the three together form a little pocket or pouch, which is likely to be a 

 receptacle for the spermatophore (spermatheca). 



In comparison with Anaspides the appendages of the perseon agree pretty closely, 

 except that in the present species the branchiae are smaller, the peduncular joint 

 of the endopodites stouter, and also the second joint represents the second and third 

 of Anaspides completely coalesced. 



Caiman says in respect of this that in Anaspides the second joint is "very small, and 

 partly fused with the third joint, from which, however, it is marked off by a distinct 

 line . . . . " and " becomes less distinct as we go backwards, while in the sixth pair the 



SECOND SERIES. — ZOOLOGY, VOL. XI. 2 





