IV 



PARASITIC CASTRATION 



101 



on the Hermit-crab, Eupagurus excavatus, var. meticulosa. 1 The. 

 ordinary males of /. mauritanicus have the appearance .shown 

 in Fig. *72, A. The abdomen is small and bears a pair of 

 copulatory styles, while the chelipedes are long and swollen. In 

 the female (B) the abdomen is much larger and trough-shaped, 



Fii;. I'l. Illustrating tin- effect of parasitic .S/.v//////,/ /(iy//<v/ on Iimclm.s 



tanicus, nat. >!/.. A, Normal male ; lum-lnix : B, normal female ; C, male infested 

 liy X<tri-ii/init (final stage) ; D, abdomen of infested female ; E, infested male in an 

 early stage of its modification. 



ami carries four pairs of ovigerous appendages; the chelae are 

 small and narrow. 



Now it is found that in about TO PIT cent <if males infected 

 with Sacculina the body lakes on to varying derives ihe female 

 characters, the abdomen becoming broad as in tin: female, with a 

 tendency to develop the ovigerous appendages, \\liile the chelae 



become reduced (Fig. 72, C). This assumpti f the lemale 



characteristics by the male under the inlluence of the parasite 

 may lie so ]ierfect that the ahdomen and chelae become typically 

 female in dimensions, while the abdomen devt-lops not only the 



1 Y. A. 1'otts, Quart. J. Micr. Sri. 1., H'Ofl, [.. 599. 



