NOTES ON OLIGOCHATES. 69 
Fic. 1.—Enlarged view of the anterior region, showing the shape of the 
brain, salivary glands, and septal glands. 
Fic. 2.—Enlarged view of the nephridium, drawn from the living. 
Fie. 3.—Section through part of the nephridium and nephrostome. Z. 
apoch. 4 mm., oc. 4 c. cam. 
Fic. 4.—Enlarged ventral view of the nephrostome, from the living. 
Fic. 5.—Hularged side view of the same. 
Fic. 6.—Transverse section through the posterior region of the nephridium. 
Z., D, oc. 4, cam. 
Fic. 7.—Enlarged view of a portion of the last region of the nephridial 
canal, from the living. 
Fic. 8.—Optical section through the body-wall. Z., D, oc. 3. 
Fic. 9.—Thread-corpuscles from a young worm (fresh). a, 0,¢. Front 
views. d. Side view. Z., D, oc. 4. 
Fic. 10.—Young (?) thread-corpuscles from an adult worm. a. Side view. 
b. Front view. Much enlarged (fresh). 
Fic. 11.—Oval (a, 4, c) and thread-corpuscles (d, e, f/). Flemming and 
carm.-alum. Z., D, oc. 4, cam. 
Fig. 12.—Oval (a) and thread-corpuscles (4, ¢). Corrosive and bor. car- 
mine. (The thread has been acted upon by the reagents leaving the cavity it 
formerly filled.) Z., F, oc. 2, cam. 
Fic. 13.—Series of figures indicating the action of water on the thread- 
corpuscle (a). Much enlarged. 
Fic. 14.—The thread after the action of caustic potash. Enlarged. 
Figs. 15 and 16.—An oval corpuscle before (a) and after (a’), and a thread- 
corpuscle before (4) and after ('), the action of lime water, 
Fic. 17.—Enlarged view of a portion of Pachydrilus, sp. (?), showing the 
long cells in the ceelom; from the living. 
Fie. 17a.—Section through an elongated cell from the ccelom of Pachy- 
drilus, sp. (?). Corrosive, bor. carmine. Z., D, oc. 4, cam. 
Fie. 18.—Cheta. Z., D, oc. 4, cam. 
Figs. 19, 20, 21, and 22.—Series of transverse sections through the sperma- 
theca, taken from before backwards. Z., B, oc. 3, cam. 
Fig. 23.—Diagram showing the communication of the spermathece with 
the exterior and the cesophagus ; in longitudinal section. 
Fries. 24, 25, and 26.—Series of longitudinal horizontal sections taken from 
above downwards, showing the relations of the spermatheca. Z., B, oc. 4 
comp., cam. 
Fig, 27.—Longitudinal horizontal section through the fifth segment of 
Marionia enchytreoides. Z., B, oc. 4, cam. 
Fic. 28.—Ameeboid corpuscles (fresh). Much enlarged. 
