North American LwmbricuUdte. 



477 



EXPLANATION OF PLATES. 



ABBREVIATIONS. 



con. </., duct connecting reservoir 

 and terminal portion of 

 penial apparatus. 

 clit., clitellum. 

 dor. ves., dorsal vessel. 



gl., glandular region of sperm- 

 atbeca. 

 y. ves., gastric vessel. 

 int.. intestine. 

 m. /.. muscular fibers. 

 in. I., muscular layer of sperm- 



athecal duct. 

 n. c, nerve cord, 

 or., ovary. 

 ov. (I. /., oviducal funnel. 



p., penis. 

 plex., intestinal plexus. 

 p. g. ves., perigastric vessel. 

 res., sperm-reservoir. 

 sep.VUI., septum of VIII. 

 sp. d.. sperm-duct. 

 sp. d. /., spermiducal funnel. 

 sp.d.po., spermiducal pore. 



sp. s., sperm-sac. 

 •sp. th. d,, spermathecal duct. 

 sp.th.po.. spermathecal pore 



st., storage region of sperm - 



atheca. 

 t., testis. 

 v. ves., ventral vessel. 



Plate XLI. 

 Premnodrilus palustris. 



Fig. 1. A diagrammatic representation of a part of the reproductive 

 organs. X 35. 



Fig. 2. A diagrammatic longitudinal section of a spermatheca, recon- 

 structed from a series of sections. X 50. 



Fig. 3. A transverse section of XI, from a specimen in which the pos- 

 terior parts of the spermathec* were included within the 

 sperm-sacs. X 45. 



