EEPOET ON THE SCHIZOPODA. 123 



series of close upon eight spiniform ciliated setee, those on the inner edge being the 

 longer. The terminal joint is very small, and armed with about five strong curved 

 spines. 



The four succeeding pairs of legs (figs. 11-15) rapidly diminish in length, and are 

 likewise strongly geniculate, but, unlike what is observed in the first pair, exhibit a 

 uniform fringe of delicate bristles along their edges. The terminal joint (see fig. 12) is 

 comparatively short in all of them and of a conical form, whereas the two preceding 

 joints are nearly equal in size. 



The penultimate pair of legs (figs. 16, IS) are exceedingly small, and, as a rule, com- 

 pletely hidden between the gills, but nevertheless have both the endopod and exopod well 

 defined ; the former, however, consists only of two joints, both of which are fringed with 

 strono- ciliate bristles. 



The last pair of legs (figs. 17, 19) are quite rudimentary, constituting merely a very 

 small linguiform, setiferous lamella, originating from a thickened basal part, and 

 apparently representing the exopod. 



The gills, although approximating in appearance to those in the genus Nyctiphanes, 

 nevertheless exhibit certain well-marked difi"erences. The three anterior pairs (see figs. 

 10, 11, 13, 20) merely constitute, as in that genus, simple stems expanded at the 

 extremity as two short branches, curving in opposite directions and provided along the 

 posterior edge with a regular series of gill-lobules. In the three succeeding pairs (see figs. 

 14-16, 21-23), however, besides this outer stem, another projects inward, also with gill- 

 lobules, which, however, are somewhat spirally disposed. The last pair of gills (see figs. 17, 

 24) are, as usual, the largest of all, and exhibit in every respect a normal appearance, the 

 outer division having along its outer edge four curved secondary stems, besides two some- 

 what smaller ones at the apex. 



The spermatophores (fig. 25) are distinctly peduncular, the distal part being expanded 

 into a rounded oval vesicle, whereas the proximal part forms a very narrow flexuose 

 stem or neck. 



The pleopoda of the female are of the usual structure, and in the male the two anterior 

 pairs have well developed copulatoiy appendages. Those of the first pau' (see figs. 27, 29) 

 are very strong, consisting of two lamellar portions folded one upon the other, the outer of 

 which projects as two highly chitinised processes, slightly dilated at the apex, and exhibit- 

 ing a sharpened and finely serrate edge ; moreover, from a rounded prominence of this 

 portion springs exteriorly a short, curved spine. The inner portion, too, is drawn 

 out to a linguiform projection, wdth a small unguiform process at the tip, and has 

 too, on the outer side, a strong spiniform process, whereas on the inner is affixed 

 the cincinnigerous lobe. The appendages of the second pair of pleopoda (see figs. 28, 30) 

 constitute an irregularly folded lamellar process, extending beyond the tip of the principal 

 plate. 



