REPORT ON THE SCHIZOPODA. 129 



The first pair of maxillae (fig. 9) are, on the whole, developed in the usual manner. 

 The terminal joint is rather narrow, and bears at the apex a double series of unequal 

 bristles, some of which are very slender. The exognath is comparatively much smaller 

 than in the genus Thysanoessa, and forms an oval lamella, fringed along the anterior 

 part with a dense row of ciliated bristles. 



The second pair of maxillte (fig. 10) exhibit a somewhat more deviating appearance, 

 having the masticatory lobes remarkably broad and arcuate at the edges, with the hinder 

 one not subdivided by a distinct indentation. The terminal joint, or palp, is exceedingij^ 

 small, lamelliform, and somewhat constricted at the base, its apex being obtusely truncate 

 and edged round with slender set^. The exognath, finally, is rather small, forming 

 merely a slight expansion of the outer edge of the basal part, but exhibiting the usual 

 fringe of ciliated bristles. 



The maxillipeds (fig. 11) are rather slender and pediform, reaching, when fully 

 extended, almost to the middle of the antennal scale. Of the joints the meral and 

 ischial are nearly equal in length, the latter, however, being much more expanded and 

 almost lamellar. The terminal joint (fig. 12) is somewhat compi-essed, and exhibits along 

 the inner edge a dense row of comparatively short, ciliated bristles. The exopodite does 

 not difier in size and structure from the true exopods of the legs. Of an epipodite no 

 trace can be detected. 



The first pair of legs (fig. 13) are very remarkable, both as regards their great length 

 and slender aspect, and their very peculiar structure. When fully extended, they exceed 

 in length even the whole body ; but, as a rule, they are found to exhibit, as in Thysanoessa, 

 a sharp geniculate bend between the meral and carpal joints, the terminal section being 

 reflexecl at a more or less acute angle. The proximal part of the leg, comprising the 

 coxal, basal, and ischial joints, appears rather strong and muscular, exhibiting along the 

 inner edge a row of very small bristles. The remaining part, on the other hand, is 

 extremely slender, indeed almost filiform, also very brittle and therefore easUy broken ofi" 

 if the specimens be not handled with the greatest care. This part, moreover, lacks every 

 trace of marginal bristles, being quite naked throughout, save at the apex, where a dense 

 assemblage of peculiar spines springs forth in the form of a brush. Of the joints, the 

 meral is much the longest, reaching far beyond the tip of the autennulas, and being very 

 movably jointed to the ischial, exhibiting a peculiar curve at its base. The carpal and 

 propodal joints are likewise very slender, the former being a trifle longer than the latter, 

 whereas the terminal joint is exceedingly minute, and firmly connected, it would seem, 

 with the preceding. It bears (fig. 14) six slender, straight spines, which, together with 

 two similar ones originating interiorly from the end of the preceding joint, constitute the 

 above mentioned peculiar apical brush. The spines, when highly magnified, present a 

 very curious appearance, being, as it were, annulated at regular intervals, and jutting 

 out at each annular segment as a recurved denticle, thus giving to one of the edges a 



(ZOOL. CHALL. EXP. — PART. XXXVH. 1885.) Oo 17 



