THE OLIGOCH^TA TERRICOLiE. PART I. £03 



very narrow stalk which is easily broken and may be seen to 

 communicate with the testicular sac by a narrow orifice. Each 

 sperm sac is prolonged distally into a very narrow appendix, 

 which arises abruptly from the rather squared end of the main 

 part of the sac. The arrangement, in fact, is very like that in 

 many other species of Pheretima, including P. decipiens described 

 in the present paper. 



It is important to note that the two sperm ducts of each side 

 join shortly behind the septum dividing segments XI and XII. 



The spermiducal glands of P. americanorum are large and ex- 

 tend through segments XVI — XXII. They appear to me to be 

 primarilj" divisible into 3 large lobes; but in any case, they are 

 greatly subdivided into small lobes of unequal size. The gland, 

 however, is solid, the lobes being close together and not separated 

 by much interstitial tissue. The duct of the gland is moderately 

 thick, and arises from about the middle of the gland. It runs a 

 perfectly straight course to its external orifice, a course trans- 

 verse to the long axis of the body of the worm. The duct of the 

 spermiducal gland does not vary in width through its course. 

 The external appearance of the genital area gave me the impies- 

 sion that there would prove to be a bursa copulatrix. However, 

 there is nothing of the kind in this species. The spermiducal 

 gland measures 11.5 millimeters in length. 



