NEW NORTH AMERICAN EARTHWORMS 171 



Spermaries and spermiducal funnels are paired in 10 and 11. 

 The sperm ducts of either side are not united but are closely parallel 

 until thej reach their outlets into the prostate duct verj^ near its 

 proximal end. Paired sperm sacs in 11 and 12 have their open- 

 ings into 10 and 11, respectively, through the septa 10/11 and 11/12 

 near the ventrolateral esophageal wall. One pair of tubular prostates 

 is present in 18. The glandular part of each is long and contorted 

 and occupies a relatively large space. The duct of each has muscu- 

 lar walls and serves as an outlet for the gland products and also for 

 the sperm cells, which enter it near the proximal end through the 

 sperm ducts of the same side. Ovaries and oviducal funnels are 

 paired in 13 and oviducts in 14. No ovisacs were recognizable. A 

 pair of spermathecae is present in each of somites 8 and 9. Each 

 spermathecal duct is short and has a thick muscular wall, and the 

 inner lining is irregularly folded. In the anterior wall of each duct 

 there is included a diverticular chamber connected by a small duct 

 with the lumen of the spermathecal duct. The ampulla of each 

 spermatheca has walls that are thinner near the duct, and the lining 

 layer is irregularly folded. In each of three sectioned specimens, the 

 ampullae in 9 are somewhat larger than those of 8, and the part 

 of the wall on the side in contact with the body wall is very thin 

 and without any folds of the lining layer. In a fourth specimen 

 the difference in the thickness and folding of the wall was less pro- 

 nounced. 



MEGASCOLIDES EISENI, new species 



Distinguishing characters. — Length of preserved specimens, 115- 

 170 mm. Average of maximum diameters, 6% mm; near middle of 

 clitelium, 4.5 mm. Number of somites, 191-205. Setal distances in 

 anterior part, approximately aa :ah:hc: cd=20 : 3 : 12 : 5 ; in posterior 

 part aa:ah:bc:cd=12:Z:d:5; dd about three-fifths of circumfer- 

 ence; penial setae long, nearly uniformly curved in plane trans- 

 verse to longitudinal axis of the worm ; distal end finely sculptured 

 and projecting from body in a ventrolaterad direction; length 1.8 

 mm and diameter 0.045 mm in most of length. Clitelium incom- 

 plete ventrally and includes 13-19 and sometimes a part of 20; 

 slightly tan-colored. Median ventral papillae on either, or both, 

 of 9/lb and 10/11; paired ventral papillae on 16/17 and 19/20- 

 21/22 or 22/23. Male pores on 18 close to penial setae and laterad 

 of them on laterally elongated elevations. Spermathecal pores, but 

 one pair and at anterior margin of 9, near setal line h. 



Septa 6/7-11/12 strongly thickened, 12/13 less thickened. Cal- 

 ciferous gland in 10-14. The two sperm ducts of either side remain 

 separate and unite with the prostate duct of the same side near its 

 proximal end. Spermathecae, but one pair and in 9. 



