1^2 



CRUSTACEA rERACARIDA 



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. Tliese 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- 

 T. no C-, • . T. ,• ,r appearing. As the para- 



FiG. 88. — biile view or Danalia cv/rvata, x 15, . " '- 



shortly after fixation and loss of larval appen- site grOWS, the heart at 



dages .4,AUmentarycanal; i?, eye ; i/, heart; ^-^q posterior end of the 



A , phagocytic cells ; O, ovary ; /', 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 

 and 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 

 has become useless^ 



In the series Bopyrina, 

 after the free -living Epi- 



1 M. Gaullery {loc. cit. p. 130) questions the trutli of this observation, luit I am 

 convinced of its accuracy. 



Fig. so — Optic il section (dorsal view) of Danalia 

 cuitata, in the same stage as Fig. 88. A, Ali- 

 mentary canal ; Ec, ectoderm ; H, heart ; X, 

 phagocytic cells ; 0, ovaries ; P, proboscis. 



