AMPHTPODA AND ISOPODA FROM BARRINGTON TOPS. 



93 



Fig. 14. Phreatoicus shephardi, 

 fourth, peraeopod of male. 



The first leg or gnathopod in 

 the fully developed male (fig. 

 13) has the propod very greatly 

 enlarged, its anterior margin 

 being extremely convex, the 

 palm oblique, nearly straight, 

 and with irregular serrations 

 w hich are mos t marked toward s 

 the base of the dactyl. The 

 fourth pair of legs (fig. 14) is 

 also modified in the male some- 

 what in the same way as it is 

 in P. australis. The merus, 

 carpus and propod are all short, 

 subequal, the propod has the 

 anterior margin very convex, the posterior is produced 

 at the articulation of the dactyl into a prominent stout 

 tooth, and the rest of this margin 

 forms a short palm defined by three 

 strong spines, against which the 

 strongly curved dactyl closely im- 

 pinges, the whole constituting a 

 powerful subchelate appendage. The 

 relative proportions of the joints and 

 the setae on them will be readily seen 

 from the figure, and need not be 

 described in detail. 



In the female the gnathopod (fig. 15) 

 is of the same general shape as in 

 the male, but is much smaller, the 

 propod being only slightly enlarged, 

 the palm straight and without evident 

 serrations. The fourth pair of legs is 

 dKtai'^S not specially modified, but is similar 

 (gnathopod) of female, to the second which is shown in fig. 



Pig. 15. Phreatoicus 



