HE:M AUKAIJLK Si'ECIES OF ECIIIUROIIW. Ö 



The Male. 



.Vs bctbit' nK'nlioiit'd, ;i iiiahî worm (lig. 2, J*l. 1.) wiis 

 discovered in the body-cavity of the t'emalc. It is to Ijo pre- 

 sumed that the male had wandered into that organ through the 

 genital passage, which in other species of the genus is known to 

 be the seat of the parasitic male. I am strongly inclined to 

 think that in the present species it is normal for the male to 

 get into the body-cavity of the female and there to reach the 

 state of maturity. 



The male in question (lig. 2, PI. I.) may be said, compara- 

 tively speaking, to be of very large dimensions. It is probably 

 the largest ever recorded from among the Bonellian species. 

 While in all the cases hitherto described the males rarely exceeded 

 2 mm. in length, that obtained by me in the present case is 

 28.0 mm. long and 2 mm. l)road in the broadest j)^!'^^- '^^^ 

 elongate body is cylindrical but tapers towards both ends. In 

 the preserved state, it is bent into a shape resembling the Greek 

 letter Ô (fig. 2). 



The unusually large size of the male worm seemed to greatly 

 facilitate the study of its structure, and I have endeavored to 

 take best advantage of that fact, with the hope of being able to 

 contribute towards settling at least some points of dispute con- 

 cerning the organization of Bonellian males. 1 think I have 

 succeeded in bringing out several noteworthy points, partly a])- 

 parently peculiar to tlie species and partly modifications or 

 emphatically developetl phases of corresponding characters in 

 other species. 



The skin presents a light yellowish color and a smooth 

 appearance. It was however ascertained by observation under 



