Physics and Chemistry. 121 



podia as has been done by Stimpson. The gastric region is 

 narrow and projects far forward as in the Maioids. The ex- 

 pansions on the sides of the carapax, which give it a Cancroid 

 form, are thin, and contain none of the internal organs, and 

 their removal would give the carapax very much the form of 

 Cryptopodia. 



