NOTES ON ACANTHODRILOID EARTHWORMS. 311 
broken up by the chaste; these are not represeuted, but occur in couples at 
the spots marked with numerals; the position of the nephridia (x. v., 2. d.) is 
also shown. JD. »v. Dorsal blood-vessel. Jné. Intestine, spirally coiled, a 
part of it showing through the septum (sep.). WV. Nerve-cord. 
Fie. 18.—About half of a segment (drawn to scale), showing the couples o 
chetz inserted in light areas, the pigmented part being represented dia- 
grammatically. 
Fic. 19.—A general view of the internal anatomy, as seen when the dorsal 
portion of the body-wall is cut away. app. Appendix of the anterior sperma- 
theca. cal. gl. Calciferous gland. .v. Dorsal vessel. iv¢. Intestine. 
ne. ne. Nephridia. pro.', pro? The two prostates. sal. Salivary glands. 
sp. 8.1, sp. s.4 The most anterior and most posteroir sperm-sacs. spth. The 
main sac of the spermatheca. 
Fig. 20.—Transverse section of cesophagus and calciferous gland, repre- 
sented diagrammatically, 
Fic. 21.—A longitudinal section of the intestine, to show its spiral coils. 
sep. Septa. 
Fie. 22.—One of the ventral nephridia (the funnel is not shown). a. The 
convoluted large and middle tubes. 0%. The coil of small tubes. [These are 
only represented diagrammatically; it is not intended to show the exact 
arrangement of a, 4.] c. The cecal portion of the bladder. p. Portion 
leading to the nephridiopore. 
Fic. 23.—Two consecutive sections (a, 4) through a nephridial funnel (from 
a series of transverse sections). c. ep. Colomic epithelium. m. Marginal 
cells. 
Fies. 24, a, b,c, d—Four consecutive sections through the degenerate 
nephridium of the second segment. In a one edge of the nephridiopore and 
a part of the dilated bladder is seen. & goes through the nephridiopore. 
coag. Coagulum in bladder. m. Muscle. I, II. Portion of wall of the Ist 
and 2nd segments: ¢ shows the tract of cells leading to the convoluted tube, 
a portion of which (¢) is present. m is the position occupied in the next 
section by the coil d. 7 shows the position occupied by the tract of cells 
represented inc. 0. v. Blood-vessels. 
Fic, 25.—An ovary attached to septum (sp/.). 
Fic. 26.—View of the prostates, &c., after removal of the gut. pe. s!., pe. s®. 
The two sacs containing penial chete. prol., pro*. The two prostates. sp. d. 
Sperm-duct. pe. d. Penial duct. 
Fic. 27.—Transverse section of a sperm-duct, showing the oval nuclei with 
long axis at right angles to the axis of the duct. 4. Blood-vessel. 
Fic. 28.—Transverse section of penial duct. Here the nuclei of the 
epithelium have their long axes radially placed. c.m. Circular muscular coat. 
lg. m. Longitudinal muscles. 
