REPOllT UN THE SCHIZOPODA. 59 



iuuer edge, with a, deuse i(jw of slender spiiiules, iu addition to the usual bristles. TIk; 

 propodal joint in the first pair (fig. 13) is quite simple, and scarcely dilated at all, forming 

 therefore no ]ialmar margin. In the two succeeding pairs (figs. 15, 17), however, this 

 joint is conspicuously dilated, and forms, at the end of the inner edge, a more or less 

 distinctly marked palmar margin (figs. 16, 18). The terminal joint or dactylus, in the 

 first pair (fig. 13), is almost straight, in the two other pairs (figs. 16, 18), on the contrary, 

 strongly curved, and denticulate at the inner edge, as also very mobile, admitting of 

 being bent in toward the palmar margin of the propodus. In the male, these two paire 

 of legs (see PI. X. figs. 14, 16) are much more powerful than in the female, the propodus 

 being exceedingly dilated and filled up with strong muscles moving the curved dactylus. 



The three succeeding pairs of legs (see PI. X. figs. 1,5) are ygtj remarkable, not only 

 by reason of their extraordinary length and slender form, l)ut on account of their 

 anomalous structure. They almost e(|ual the whole body in length, if the caudal fan be 

 excepted, and, in the specimens j^reserved in spirit, generally exhibit a strong elbow- 

 shaped curve at the junction between the ischial and meral joints, the proximal section of 

 the legs being more or less directed backward, whereas the terminal section extends at 

 rio-ht aneles with it anteriorly, reaching far in advance of the fore part of the bod\' 

 (see PL X. fig. 1). They all exhibit a very similar structure, except that the basal 

 joint diminishes rapidly in length posteriorly, while the terminal section of the leg 

 in a corresponding degree increases in length, though more sHghtly. Hence they all 

 reach, when stretched out anteriorly, to about the same transverse line. Of the several 

 joints, the basal one is quite remarkable for its considerable length, more especialh^ in the 

 first of the above pairs (fig. 5). The proximal part of this joint is somewhat dilated, and 

 strongly curved, whereas the distal part is very slender, and, in the first of these pairs, 

 projects even far beyond the tip of the exopod. The ischial joint is comparatively short, 

 and somewhat dilated at the end, where it contains the muscles moving the terminal 

 section of the leg. This is exceedingly slender, and, like the remaining part, but very 

 sparingly beset ^dth short bristles. The meral joint is a trifle longer than the caqial, and 

 somewhat curved. The propodus, too, is somewhat shorter than the carpus, and slightly 

 dilated at the base, tapering toward the apex, and exhibiting at the distal part of the 

 inner edge a distinctly marked palmar margin, armed with long, slender spines. The 

 terminal joint, finally, forms an exceedingly movable, almost straight, claw, spinulose at 

 the inner half, and admitting of being lient closely in towards the palmar margin. As to 

 the function of these peculiarly formed legs, it is diflicult to form a definite oi)inion, 

 without having observed the living animal. They would not seem to lie specially adajited 

 for the usual ambulatory motion, but are more likely used for the purpose of seizing hold 

 of any delicate submarine objects, as Hydroids or Crinoids, fixed at the sea bottom. 



The last pair of legs (see PI. X. fig. 2) are rather elongate, though falling con 

 siderably short of the length of the three preceding pairs, nor do they exhibit their 



