1882.] 

 The 



Some of its Developmental Stages. 



es were removed from under the lobes of the 

 abdomens of the females (one male in each female, and always on 

 the same spot) and placed on paper wetted with salt water, where 

 they slowly walked about in a sideways direction. The females 

 moved their legs to and fro, and contracted their abdomen only 

 on touching the ventral appendages. They kept rapidly paddling 

 with their gill-like cephalic appendages as mentioned above. I 

 presume that the male and female get their necessary aeration 

 through the motions of the gills of the prawn, and as the em- 

 bryos are laterally covered by the marsupial lobes of the females, 

 and exteriorly by the carapace of the prawn, the additional fan- 

 ning of the female cephalic appendages is intended for aerating 

 the eggs or the embryos only. The functions of the gills in the 

 carapace of the prawn infected with the Bopyrus, are undoubtedly 

 impaired through the presence of the latter, thus shortening the 

 life of the former; the lessened aeration conditions but one brood 

 of the Bopyrus; both adults of the latter gradually die off in ratio 

 with the prawn. 2 The embryos after quitting their larval skin, 



FIG, 2.—Bo/>yrus pahtmoneiicola Pack. 



, much enlarged. 







view of male; D, male, side view; (*) c 



, eggs; in, male. 



1 This is also the case with Cymothoa, 



according to Pr< 



Annals Mag. Nat. History, Ser. v, Vol. 2, 







>f the family Cyr 



2 The suggestion that the Cpyrus and it 





ported by several experiments '>>' placing 



separately about 







stance the infected prawns died several hou 



irs before the non 



