State of Development in Brachydesmus. 



283 



figures 2 and 3 (dotted parts) could easily be seen. Their 

 development was so advanced that two joints could be 

 distinguished; a basal lateral joint (co) , the outline of 

 which is very distinct, is the equivalent of the distal coxa] 

 process, with the inner face of which articulates the second 

 joint or telopodite (te) ; the base of the coxa dipping in the 

 general cavity of the body is hidden from view. The second 

 joint is almost entirely visible — that is, as far as not concealed 

 by the eoxal process. When viewed from the side (fig. 2) 

 it is represented by a rather stoutish stern feebly arched 

 backwards and with a slightly concave posterior surface. 



Fig. 



The same ; posterior surface. (Same lettering as fig. 2.) 



If is divided at its second third into a posterior transverse 

 rounded ridge (r 1), which is scarcely protruding; and an 

 anterior tapering, antero-posteriorly flattened process (7' 2), 

 which is longish and angularly directed backwards, over- 

 lapping the posterior rid»e. 



That these organs should be gonapods can by no means 

 be contested ; their location and structure leave no room 

 for auy other hypothesis. Moreover, should these organs 

 be compared with the gonapods of other full-grown adult 

 Polydesmids, a striking general resemblance will be found 



19* 



