588 



ON THE YOUXG OF THE ROBBEK CRAB. 



ones. These processes are not fringed. It will be seen that Mayer's primitive form 

 of telson does not occur in Birgus (26). 



On the other hand, the condition found in sundry other Macrura Anomala 

 (Eupagurm, Spiropagia-us, Galathea) in which the fourth bristle is longer than the rest, 

 fore-shadowing the arrangement in the crabs where this becomes the end of the 

 telson-fork, is also wanting in both the embryonic and larval telson of the present 

 genus. 



Fig. .5. 

 Second maxilla. 



The limbs are eight in number, rudimentary thii-d maxillipeds being present. The 

 first antennae are simple structui-es, unjoin ted and bearing hairs at the tip. The second 

 antennae (Fig. 2) consist of a basal joint prolonged without articulation into the endopo- 

 dite, and bearing as exopodite a broad scale resembling that of Spiropagurihs (27) with a 

 tooth at the outer ahgle and feathered bristles on the inner edge. The usual spine 

 at the base of the exopodite is also present on the basal joint of the limb. 



Fig. C. 

 First maxiUiped. 



The mandibles (Fig. 3) are somewhat highly developed, that on the right more so than 

 the left one. The former has a strong apical tooth, a cutting edge, and a complicated 



Fig. 7. 

 Second maxilliped. 



molar-like process. The latter two divisions are less strongly marked in the left 



