CRUSTACEA PERACARIDA 



CHAP. 



large cells at the interior borders of the testes begin to feed 

 upon the remains of these organs and to grow enormously in 



size and to multiply by 

 amitosis. These phago- 

 cytes, as they really are, 

 attain an enormous size, 

 but they are doomed to 

 degeneration, the chrom- 

 atin becoming dispersed 

 through the cytoplasm, 

 and the nuclei dividing 

 first by amitosis and then 

 breaking up and dis- 

 appearing. As the para- 



Fio. 88. Side view of Danalia rum-it ft, x 15, 5 



shortly after fixation and loss of larval appen- Site gl'OWS, the heart at 



dages .4, Alimentary canal; E, eye; H heart; the poster i or en( J o f t he 

 j\ , pnagocytic cells ; O, ovary ; I', proboscis. 



body ceases to beat ; the 



ovaries increase enormously at the expense of the alimentary 

 canal, and on the ventral 

 surface two pairs of sper- 

 mathecae are invaginated 

 ready to receive the sper- 

 matozoa of a larval male. 

 In the adult condition, after 

 fertilisation has taken place 

 und the ovaries occupy 

 almost the whole of the 

 body, the remains of the 

 phagocytic cells can be 

 seen on the dorsal surface 

 in a degenerate state. They 

 evidently are not used as 

 food, and their sole function 

 is to make away with the 

 male organisation when it 

 lias become useless. 1 



N - 



Iii the series Bopyrina, 

 after the free -living Epi- 



FIQ. 89. Optical section (dorsal view) of Danalia, 

 i-i/reata, in the same stage as Fig. 88. A, Ali- 

 mentary canal ; EC, ectoderm ; H, heart ; -V, 

 phagocytic cells ; 0, ovaries ; P, proboscis. 



1 M. Caullery (loc. cit. p. 130) questions the truth of this observation, but I am 

 convinced of its accuracy. 



