1901.] 



AND AREANGBMUNT OF EARTHWORMS. 



193 



contracted sttite of the worm render it a little difficult to map this 

 portion of the sperm-sacs accnrately. The reason is that the greatly 

 bulged divisions of the sperm-sacs do not lie so plainly and simply 

 side by side as they do both anteriorly and posteriorly ; they are 

 somewhat intertwined by the exigencies of space in relation to 

 their own increasing bulk, but do not, at least so far as I have 

 been able to ascertain, intercommunicate at these points. In any 

 case there is no doubt that at the very end of their course the 

 two sperm-sacs are perfectly continuous, there being no externally 

 visible break where one passes into the other ; the two sacs thus 

 end posteriorly in a somewhat horseshoe-shaped loop. 



The sjpenniducal glands measure about 20 mm. in length ; but 

 they do not occupy a corresponding length of the body since each 

 is bent once and sharply upon itself ; this bend does not mark off 

 the spermiducal gland into two regions, though each gland can be 

 so divided. When the gland emerges from the terminal bursa 



Text-fig. 58 



Polytoreutiis grego7-iamis. Genitalia, X 2. 



A, posterior lateral diverticula of spermatliecal sac ; F, anterior do. ; E, i-ecep- 

 taculum ovorura ; D, ruediau part of spermatliecal sac; C, terminal bursa 

 copulatrix, into which open B spermiducal glands. 



copulatrix, through which it communicates with the exterior, it is 

 at first narrow ; it then gradually widens and forms an elongated 

 heart-shaped tube, from the middle of the end of which arises the 

 distal part of the spermiducal gland ; the relations of the latter to 

 the former part are very much those of a small intestine opening 

 into a large intestine which is furnished at the junction of the 

 two with two short blunt caeca. The point of junction of the two 



