10 Carl Bovalliüs, 



the segment) truncate, and the hinder margin excavate. At the inside of 

 the upper corner is a tuberculous prominence, against which the upper 

 end of the femur articulates; the epimeral is as deep as the length of 

 the femur of the correspondent leg, quite as large as the femur of the 

 fifth pair. The epimerals of the fourth segment are scarcely as long 

 as the segment [PI. I, fig. 14], deeper than long, the anterior margin 

 rounded, the posterior straight; at the middle of the upper margin 

 there is on the inside of the epimeral a tubercular projection for the arti- 

 culation with the leg. The epimeral reaches as far down as half the 

 length of its femur, and is partly concealed by the femur of the fifth 

 pair of pereiopoda. The epimerals of the fifth and sixth segments are 

 longer than the segments, rounded at both ends, more than twice longer 

 than deep; the posterior portion is a little deeper than the anterior. 

 The last epimerals are shorter than the segment and smaller than the 

 preceding, but of the same form. [PI. I, fig. 17]. 



The branchial sacks are fixed at the bases of all the pereiopoda 

 with the exception of the first pair. Those of the second to fourth seg- 

 ments [PI. I, fig. 14] are longer than the corresponding femora and 

 very large, the following [PL I, fig. 15 and 16] equal the length of the 

 femora and are more slender. 



The ovitectrices [PI. I, fig. 18] are attached to the bases of the 

 second to sixth pairs of pereiopoda; they are long, narrow laminae, a 

 little broader at the lower ends, feebly bent inwards. They carry 8 — 12 

 long, simple hairs around the lower ends. They are a little shorter than 

 the corresponding branchial sacks. 



The first pair of pereiopoda [PI. I, fig. 12]. The femur is long 

 and narrow, a little broader at the lower end, with two plumose hairs at 

 the lower anterior corner; the genu is short, the tibia twice longer. The 

 carpus is very large, dilated, nearly ovate, more than twice longer than 

 the two preceding joints together and fully as long as the femur. It 

 carries a single long hair at the lower anterior corner; the hinder mar- 

 gin is nearly semicircular, bordered with 14 plumose hairs, which are as 

 long as half the breadth of the joint; at the lower posterior corner 

 there is a long, plumose hair, longer than the metacarpus. The meta- 

 carpus is very dilated, with the anterior margin feebly, the posterior 

 strongly curved; it is only a third longer than broad. The hinder 

 margin is fringed with 14 plumose hairs and, at their bases some 

 short, simple hairs. At the lower end of the joint around the dactylus 



