REPORT ON THE SCHIZOPODA. 199 



Thus, the spine issuing anteriorly from the anterior lij) (fig. 6) is relatively much 

 shorter, and the terminal lobes of the posterior lip (fig. 7) are obtusely truncate in 

 front. 



The mandibles (fig. 8) are chieHy distinguished from those in the tj^ical species by 

 the terminal joint of the palp being more elongate and narrow. 



On the first pair of maxillse (fig. 9) the outer lobe is more regularly curved, and the 

 rudimentary esoguath somewhat shorter. On the second pair (fig. 10) the terminal joint 

 of the palp slightly difi"ers in form, being comparatively shorter and broad in the middle, 

 and having, moreover, a dense fringe of delicate cilia along the outer edge. 



The maxillipeds (fig. 11) are comparatively less robust, and have at the inner corner 

 of the basal part a distinct, densely setiferous masticatory lobe. The last joint of the 

 endopodite is triangular, and its apical spine shorter than in Anchialus typicus. The 

 epipodite, on the other hand, would seem to be comparatively larger. 



The gnathopoda (fig. 12) are also much more slender than in the preceding species, 

 and agree more in structure with those in other Mysidans. 



The legs (fig. 13) are densely setose, especially along their inner edge, the setse 

 exhibiting a conspicuous fascicular arrangement. The terminal part is rather produced 

 and very narrow, exceeding in length the preceding (carpal) joint, and is, moreover, 

 subdivided into a rather great number of short articulations, no less than seven being 

 counted on the middle pairs. The first pair of legs in the male do not seem in this form 

 to exhibit any difference from those in the female. 



Of the caudal limbs in the female, the three anterior pairs are developed in the usual 

 manner, whereas the two posterior are represented merely by laminar exj)ansions of the 

 sternal parts of the segments, as is in the preceding species the case with all saving the 

 first pair. 



In the male, all the caudal hmbs are natatory, but difier from those in the male of 

 Anchialus typicus by the basal expansion of the inner branch being far less developed 

 (see figs. 14, 15). Moreover, the outer branch of the fourth pair (fig. 16) is greatly pro- 

 duced, styliform, and composed of eleven articulations, the six outer of which are armed 

 with spines instead of natatory setae. Of the articulations of this branch the antepen- 

 ultimate is much produced, and bears at the end, exteriorly, a rather elongate spine ; the 

 two succeeding articulations, on the other hand, are very small, and the last of them 

 has two short apical spines. 



The telson (fig. 17) exhibits an appearance very similar to that in the typical species, 

 being, however, somewhat narrower and slightly tapering toward the apex, with tw'enty 

 to thirty lateral denticles on either side. The apical incision occupies about one-sixth of 

 the length of the telson, and has a form perfectly similar to that in Anchialus typicus. 

 The terminal lobes bear a rather elongate apical spine, and are densely fringed along 

 their inner edge with rather strong spinules. 



