696 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxm. 



genera. The female differs from the female of Aspidojyhryxus in 

 having the abdomen segmented, in the larger and differently shaped 

 head, in not having the lateral parts of the thorax projecting in 

 front of the head, and in having five pairs of incubatory plates, there 

 being only one pair distinctly developed in As'indophryxuH. 



Bonnier says of the male of Prodajas lohiancoi that the abdomen 

 is " a peine segmente sar les bords et termine par une paire de longs 

 uropodes digitiformes." Uropoda are also present in the male of 

 Aspido-phryxus Sars. The male of Arthrophryxus is without uropoda. 



