EPICAKIDA LIFE-HISTORY OF BOPYRUS 



133 



caridian and Cryptoniscus stages, a further larval state is assumed, 

 called the Bopyrus, which is the functional male, and, after per- 

 forming this function, passes on to the adult female condition. 



The family Bopyridae is parasitic in the branchial chamber 

 of l)eeapoda, especially Macrura and Anonmra. When one of 

 these Decapods is infested with an adult Bopyrid the gill-chamber 

 in which it is situated is greatly swollen, as shown in Fig. 90. 

 A very common Bopyrid is Bopyrus fougerouxi, parasitic in the 

 gill - chambers of Palanmi serratus. The Bopyrus larva or 



FIG. 91. Ventral view of male 



/,'iyy///'" --'./'"'.'/'/"/'.'/, X 30. 



.1, 1st and -2nd antennae; 

 T, 8th (last) thoracic ap- 



I Al'tiT J'.oiinin. I 



B 



FIG. 90. Galathea intermedia, with 

 a J'linr/i/'ri//i/<t mierobranchiata 

 tinder its left branchiostegite 

 (B), x I. (After Sars.) 



functional male has the appearance shown in Fig. 01. It 

 differs from tin- Cryptoniscus stage in possessing a rudimrni a im- 

 pair of anterior thoracic limbs and seven pairs normally 

 developed, while the abdominal limbs are plate - like and 

 branchial in function. The male can often l>e found attached 

 to the female beneath the last pair of incubatory lamellae. 



The adult female condition, which is assumed after l he 

 Bopyrid stage is passed through, is illustrated in Fig. 92. 

 The body acquires a remarkable asymmetry, due f<> the unequal 

 pressure exerted by the walls of the gill - ehamher. The 

 antennae and mandibles (Fig. 92, B) are entirely covered up by 

 the largely expanded maxillipedes ; maxillae are. as u-iial, entirely 



