GENUS PORCELLANA. 



180 



ters. The form of the carapace, however, recalls that 

 of the true BRACK YURA. 



After a very careful consideration, I cannot place the 

 genus jiEglea in a different family from Galathea, nor the 

 present genus from JEglea ; I have therefore thought it 

 necessary to form one large family of the two families 

 Porcettaniens and Galatheides of Edwards. They differ 

 in few important particulars, excepting in the comparative 

 development of the abdomen, and a corresponding differ- 

 ence in their natatory powers ; and the general form is so 

 similar when the abdomen of the present genus is displayed, 

 as to show to the most casual observer how near is the 

 affinity. 



