Xorth American Lumbrlculidce. 



477 



EXPLANATION OF PLATES. 



ABBREVIATIONS. 



con. (I., duct connecting reservoir 

 and terminal portion of 

 penial apparatus. 

 cUf., clitellum. 

 '/or. ves., dorsal vessel. 



r/L, glandular region ofsperm- 

 atlieca. 

 r/. re.s'., gastric vessel. 

 int.. Intestine. 

 Ml. /., muscular libers. 

 »(. I., muscular layer of sperm- 



athecal duct. 

 n. c, nerve cord. 

 ov., ovary. 

 or. d. /., oviducal funnel. 



p., penis. 

 plex., intestinal ple.xus. 

 p. g. res., perigastric vessel. 



res., sperm-reservoir. 

 sep.VIII., septum of VIII. 

 «p. d.. sperm-duct. 

 sp. d. /., spermiducal funnel. 

 sp.d.po., spermiducal pore. 



sp. s., sperm-sac. 

 «p. fh. (/., spermathecal duct. 

 sp.th.j)o.. spermathecal pore 



•sf., storage region of sperm - 



atheca. 

 t., testis. 

 V. ves., ventral vessel. 



Plate XLL 



Pre in nodrilus j^xdustris. 



Fig. 1. A diagi'ammatic 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 spermathecte were included within tlie 

 sperm-sacs, x 45. 



