130 JESSE LE ROY CONEL 



lobes are present in any part of the mesovarium of any of the 

 females, not even in the posterior region. 



Male. No female elements occur in any of the males, and 

 none of the mesorchia presents the appearance of ever having 

 contained eggs. The general structure and appearance of the 

 mesorchium is very similar in all the specimens. It extends 

 from the region of the gall bladder to the caudal end of the body 

 cavity, and is attached to the mesentery along a line which is 

 about one-third the width of the latter from the alimentary 

 canal (fig. 85). At the anterior end the mesorchium is merely a 

 line along the dorsal surface of the digestive tract. At a point 

 opposite the posterior end of the gall-bladder it leaves the ali- 

 mentary canal and gi-adually ascends in the mesentery to its 

 definitive position. Immediately behind the gall-bladder it is 

 from 1 to 3 mm. wide, and retains this width to the testis lobes 

 at the posterior end, usually decreasing slightly in width just 

 before reaching the lobes. In most of the males the mesorchium, 

 which is very delicate, contains no genital elements in the ante- 

 rior and mid-regions, but in some individuals very small testis 

 lobes are scattered along the distal margin of the mesorchium 

 from the extreme anterior end to the band of lobes at the posterior 

 end. One male has a single lobe about 0.5 mm. in diameter at 

 the anterior end of the mesorchiimi and no others excepting 

 those in the testis band at the posterior end. Other specimens 

 have two or three such small lobes, still others a dozen or more, 

 while one animal has so many that they look as though at one 

 time they formed a continuous narrow band along the distal 

 margin of the mesorchium. 



The large mass of testis lobes is confined to the posterior end 

 of the mesorchium, and consists of a great many lobules closely 

 crowded together into a band, which varies in length, in the 

 seven males examined, from 3 to 8 cm. and in width from 2 to 

 7 mm. There is no correlation between the length of the testis 

 band and the length of the animal, as is shown by the following 

 table : 



