Shite 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 coxal 

 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 coxal process. When viewed from the side (fig. 2) 

 it is represented by a rather stoutish stem feebly arched 

 backwards and with a slightly concave posterior surface. 



Fiar. :;. 



\ ;.. 



CO. 



• -/' 



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



It is divided at its second third into a posterior transverse 

 rounded ridge {r -/), which is scarcely protruding ; and an 

 anterior tapering, antero-posteriorly flattened process (r2), 

 which is longish and angularly directed backwards, over- 

 lapping the posterior ridge. 



That these o7*gans should be gonapods can b}' 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* 



