132 



CRUSTACEA PERACARIDA 



FlQ. 88. — Side view of Danalia curvata, x 15 

 shortly after fixation and loss of larval appen 

 dages. A, Alimentary canal ; £, eye ; tl, heart 

 iV, phagocytic cells ; 0, ovary ; P, proboscis. 



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- 

 site grows, the heart at 

 the posterior end of the 

 body ceases to beat ; the 



ovaries increase enormously at the expense of the alimentary 



canal, and on the ventral o 



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- 



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

 convinced of its accuracy. 



Fia 



Optical section (dorsal view) of Danalia 

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

 mentary canal ; Jic, ectoderm ; IT, heart ; jV, 

 phagocytic cells ; 0, ovaries ; P, proboscis. 



