14 ON THE ZOMk OF CARDISOMA ARMATUM. 



reared to the second larval stage, this cannot be verified. It is 

 interesting to note in this connection that Miss Webb [1919], in 

 the larvag of Upogebia, found two distinct forms. The difference 

 in this case concerned the number of exopodites furnished with 

 swimming setfe occurring on the thoracic legs, and became first 

 evident at the commencement of the 2nd larval stage. Possibly 

 the case recorded here is an analogous case of jjolymorphism. 



Literature. 



Calman, W. T. 1909. P. Z. S. 1909, p. 703. 

 Hyman, 0. W. 1920. Journ. Morph. xxxiii. p. 485. 

 MoREiRA, C. 1912. Mem. de la Soc. Zool. de France, xxv. 



p. 155. 

 Webb, G. E. 1919. Journ. M. B. A. xii. p. 81. 



