94 CALIFORNIA ACADEMY OF SCIENCES. 
PLATE XXXTI. 
PH@NICODRILUS TASTE. 
5. A transverse section of the body-wall in somite xvii, through the male pore showing the degenerated atrium 
and the wider upper part where enters the spermduct. These latter have just been fused and enter the pore 
as one single duct. cl. clitellar cells. Ay. hypodermal layer. cl. collar of epithelium of the atrial chamber. 
ac. m. arciform muscles. (f. sp. fused spermduct just entering the atrial chamber. J. m. longitudinal mus- 
cular layer of body-wall. é. m. transverse muscular layer of body-wall. 4 male pore. 
6A. The section nearest anterior to the former, showing the spermducts just as they enter the atrial chamber. 
The spermducts are not yet fused. Figures indicate the same as in the preceding figure. sp. spermducts just 
before being fused together. 
6B. Section nearest anterior to the former showing the two spermducts, ete. 
7. The three somites xvi, xvii and xviii viewed from the interior, the alimentary canal and nuerve-cord having been 
removed, as well as nephridia. 
8. One of the sete magnified, the same relative proportion as that used in my paper on Ocnerodrilus. 
9A. One of the nephrostomes seen in front views. When in proper position the face of the rosette stands 
parallel to the septum. +. rosette proper. . neck with very large glandular cells. . d. narrow duct. 
s. septum. f. fold of the main nephridial body. 
9B. Nephrostome seen from the side, the position when the body is opened and spread out. Letters indicate the 
same as in the last figure. 
10. One of the muscles connecting septal glands with body-wall, in cross-section. s. septum. m. muscular 
fascicle. 
11. One of the posterior nephridia seen under a low magnifying power in order to show the peritoneal covering 
and the general outline of the canals in the lower peritoneal lobe. a. /. anterior fold of canals. p./. posterior 
fold of canals. spu. the partially free spur. s. septum. st. nephrostome. xp. nephropore. w.t. the 
wide tube leading to the nephropore. br. bridge connecting the spur with one of the folds. wu. /. upper 
lobe of peritoneal cells which does not contain any canals. c./. connecting lobe. /. l. lower lobe. The two 
peritoneal lobes vary greatly in shape and hardly two are found exactly alike, though the |general form is the 
same in all, 
