Effects of Castration in Insects 



411 



been continued and deepened by Geoffrey Smith ('06, '09) on the 

 spider crab Inachus mauritanicus infested with the cirriped Sac- 

 cuhna neglecta and by Potts ('06, '09) on hermit crabs (Eupa- 

 gurus meticulosus) infested with the cirriped Peltogaster curva- 

 tus. A summary of the work of these two authors will not be 

 out of place here, since they have reached rather definite con- 



Fig. 5. Specimens of Inachus mauritanicus to show effects of parasitic Sacculina neglecta. A 

 normal male; B, normal female; C, male infested with Sacculina (final stage) ;D, abdomen of infested 

 female; £, infested male in an early stage of its modification. (.After Geoffrev Smith.) 



elusions not without a bearing on the various cases of parasitic 

 castration in insects and other organisms to which I shall have 

 occasion to refer. 



According to Geoffrey Smith ('09) the abdomen of the normal 

 male of Inachus mauritanicus "is small and bears a pair of copu- 

 la tory styles, while the chelipedes are long and swollen (Fig. ^A). 

 In the female (Fig. ^B) the abdomen is much larger and trough- 



