CALIFORNIA ACADEMY OF SCIENCES. 
PLATE LIL. 
ALEODRILUS KEYESI. 
Section through the epithelium of tubular intestine, showing a cluster of glands between the epithelial cells. 
bl. blood lacune. 
Section through one of the valves of the heart. /. c. large cells at the base of the valves. 
Some spermatogonia from the sperm-sacs in xii. 
Cells from the central germinative and in the sperm-sac. 
One of the nephridia with an anterior lateral vessel, connecting dorsally with a branch from the ventral vessel. 
d.v. diverticula of the lateral vessel. Jat. v. lateral vessel. 
ACANTHODRILUS TAMAJUSI. 
The largest of my specimens, natural size. This specimen is strongly contracted, and was when alive con- 
siderably longer. 
The anterior somites, ventral view. 
The anterior somites, dorsal view. 
The anterior somites, side view. 
The ventral part of the genital region in the clitellum, showing genital papillw, the three transverse genital 
ridges, penial set#, common seta, etc. The clitellum is not well developed, but in somite xx may be seen its 
posterior termination. The other one of my specimens, which possessed a more developed clitellum, had 
these papille less pronounced, though of the same form and arrangement. 
Cross-section of the body-wall, showing the common sete. 
The free end of the penial seta. 
The spermathece, dorsal view. 
One of the spermathece dissected out. 
