422 Miss H. K. Brade and the Rev. S. G. Birks on 



of legs are also slightly modified, the joints being thicker 

 than those of the normal walking-legs, and pads are present 

 on the fourth and fifth joints — that is, the penultimate and 

 antepenultimate joints (fig. 4). The claws are strong, and 

 the last joints are armed with strong bristle-like spines, 

 some of which overlap the claws. The coxite bears a 

 secretory organ (fig. 4, s). Tlie copulatory feet or gonopods 

 are composed of the modified appendages (two pairs) of tlie 

 seventh body-segment. Their situation is denoted by a gap, 

 as these legs are retracted, in this group, within the somite to 



Figs. 5-8. — Gonopods. A, anterior gonopod ; B, posterior portion of 

 posterior gonopod ; C, anterior branch of posterior gonopod ; 

 a, h, e, parts of ; F, ilagellum ; d, hooked part of B ; L-L, 

 point of measurement (see text). 



Fig. 5. — Silhouette of anterior gonopods, anterior surface. X 140. 



H. K. B. del. 

 Fig. 6. — Silhouette of posterior gonopods, posterior surface. X 140. 



H. K. B. del. 



which they belong. They are complicated in character, and 

 tiie anterior and posterior gonopods of each side are firmly 

 attached to one another. The anterior pair of gonopods are 

 seen from an anterior position as two lobe-like projections 

 rounded at the tip (fig. 5). From a posterior position the 

 posterior pair appear as two pointed projections with the tips 

 turned inwards, broader at the base tlian at the tips (fig. 6). 

 Viewed from tlie side the external surfaces of the anterior and 

 posterior gonopods are seen (fig. 7). They are clearly sepa- 

 rated at the free ends and united at the bases. The anterior 

 gonopods are stronger and generally less transparent than the 

 posterior pair, which is delicate and very transparent, some 

 parts being irregular in outline. 



