62 PROCEEDINGS OF THE NATIONAL MUSEUM vol. loe 



13, the pair in segment 10 being stout and lacking commissural con- 

 nectives. Excretory system meronephric. Exonephric integumen- 

 tary micronephridia in all but the first two segments; enteronephric 

 meganephridia on all septa behind 15/16 ; enteronephric micronephridia 

 on the lateral walls of the pharynx. Male reproductive system holan- 

 dric. Paired testes and spermiducal funnels in segments 10 and 11; 

 paired seminal vesicles in segments 11 and 12. Testes and funnels of 

 segment 10 and testes, funnels, and seminal vesicles of segment 11 

 enclosed in large membranous testis sacs that may be annular or U- 

 shaped. Seminal vesicles of segment 12 enclosed in a membranous 

 sac. Prostate gland well developed in segments 17 to 19, with a 

 large coiled prostatic-spermatic ectal duct in segment 18; accessory 

 glands small, located near end of duct in segments 17 and 19. One 

 pair of ovaries and oviducal funnels in segment 13. Internal ar- 

 rangement of spermathecae variable; typically the first pair is located 

 in segment 7, while segment 8 contains the posterior two pairs. 

 Spermathecal ampulla long and oblate; diverticulum twice the length 

 of ampulla, its coUed duct terminating in a small round chamber. 



Type: Perichaeta hupeiensis Michaelsen (1895), Hambm-g Museum. 



Summary: The anatomy of Pheretima hupeiensis Michaelsen, a 

 megascolecid earthworm indigenous to the far east, has been rede- 

 scribed on specimens collected in Westchester County, N. Y., where 

 it occurs as a peregrine. A constant isometric relationship exists 

 between length and width when worms are preserved under standard 

 conditions. The population shows a high degree of uniformity. 

 The only characters showing variation are the intestinal caeca, which 

 may arise in segments 27 or 28, and the spermathecae, which are 

 constant in number but vary in their position relative to the adjacent 

 septa. 



