216 W. BLAXLAND BENHAM. 
showing arrangement of organs. Drawn from a sketch of a living specimen 
slightly compressed. Portions of body-wall are represented showing the 
pores of sperm-ducts and spermathece. 
Fig. 18.—The male duct isolated by compression. Sp. f/ Spermiducal 
funnel.. Sept. Septum between Segments x and x1. Sp. d. Sperm-duct. 
gl. atr, Glandular region of atrium. x. gl. atr. Non-glandular region of 
atrium. The extent of cilia is shown. The chitinous coat of the penis is 
represented in black outline. 
Fic. 19.—A spermiducal funnel, with lips partly closed during movement 
of worm. 
Fic. 20.—Two atria, isolated by compression, in order to show the artificial 
character of the dilatations of atrium. sp. d. Sperm-duct. prost. Prostate. 
gl. at. Glandular region of atrium. 2. g/. at. Non-glandular region of atrium. © 
Fie, 21.—Enlarged view of penis from living worm, slightly compressed. 
The drawing is sufficiently explained. a, 4, point to the circumpenial and 
pre-penial regions of penial chamber lined by invaginated cuticle. v. ch. Ven- 
tral chete. 
Fic, 22.—Longitudinal section through penis, to show character of 
the cells of this region. a. Circumpenial; and 4, pre-penial portions of 
penial chamber. cf. pe. Chitinous coat of penis, which is continuous with 
cuticle lining penial chamber. ep. 6. Epidermis. a¢r. Portions of atrium. 
Fie. 23.—Longitudinal section through portions of atrium and prostate. 
c. ep. Colomic epithelium covering prostate, sperm-duct, &c. ep. Epithelium 
lining the non-glandular part of atrium (. g/. aér.). ep’. Epithelium lining the 
glandular part of atrium (g/. atv.). mus. Muscular coat of atrium. pro. Pros- 
tate. sept. Septum between Segments xI and x11. sp. d., sp. d', Transverse 
and longitudinal sections of sperm-duct. 
Fie, 24.—A cell from prostate enlarged. vac. Vacuole, 
Fie. 25.—A cell from epithelium of glandular part of atrium. 
Fic. 26.—Section through spermathecal pore and neighbouring part of the 
the organ. ep. Epithelium of spermatheca (the internal boundaries of the 
cells have been made too definite). ep’. Epithelium of neck. ep.d. Epi- 
dermis. c. ep. Celomic epithelium. ms. Muscular coat. p. Spermathecal 
pore, 
Fie, 27.—A cell from epithelium of neck of spermatheca. 
Fic, 28.—A sperm-rope. 
Fic, 29.—A portion of sperm-rope, more highly magnified. a, Very highly 
refractizig wall, with heads of spermatozoa. 4. Layer of granules within. 
c. Mass of spermatozoa in cavity. d. Tails of those spermatozoa whose heads 
are embedded in a. 
Fic. 30.—Portions of crushed sperm-rope, the wall of which has burst, and 
spermatozoa from within are escaping. 4, 4, c, as in Fig. 29. 
