44 



MR. C. L. BOULENGER ON 



[Jan. 14, 



tr.a,ces of hermaphroditism. This phenomenon is therefore of 

 very rare occurrence in the adult males. 



My experience with immature specimens was however very 

 different, for in these I found that the presence of ova was the rule 

 rather than the exception. 



Text-fig. 14. 

 es. 



Testes of two individuals of Orcliestia deshayesii, to show the position of 

 the ova. X 40. 



c, cavity of the testis ; es., egg-sac ; ov., ovum ; sp., developing spermatocytes ; 

 V.S., vesicula seminalis. 



In the smallest males which I was able to dissect (approximately 

 8-10 mm. in length with scarcely differentiated gnathopoda) the 

 testes had not yet acqtiired their characteristic fusiform shape, 

 these organs appearing as long narrow bands extending along each 

 side of the thorax. Even at this stage ova had already made their 

 appearance among the germ-cells, and could be easily distinguished 

 from the spermatocytes by their greater size, oval shape, and by 



