180 
42. 
43A. 
43B. 
43C. 
43D. 
43E. 
444A. 
44B. 
440, 
45. 
CALIFORNIA ACADEMY OF SCIENCES. 
PLATE XLVIIIL. 
BENHAMIA NANA. 
Section through one of the prostate pores, showing prostate, sac with penial sete and the thickened spermduct. 
x. at this point the clitellar cells cease. c. ¢. connective tissue between the two muscular layers. 
Cross-section of the thickened part of the spermduct, showing the two lumens separate. 
Section through the muscular part of the prostate, showing the epithelium and some of the muscles nearest 
the lumen. 
One of the posterior nephridia; the shaded sac-like part represents the ccelomic mantle. It is generally covered 
with capillaries to such an extent that the structure of the organ is obscured. br. bridge. nec. neck of nar- 
row duct. spr.spur. o./f. anterior fold. p.f. posterior fold. 
One of the anterior nephridia, showing absence of ccelomic glands, also the arrangements of blood vessels. 
Part of the nephridium more magnified. No capillaries are represented. 
Part of celomic mantle of one of the posterior nephridia. se. secreted matter staining very deep. zn. nuclei of 
the glandular cells. 
BENHAMIA PAPILLATA. 
A specimen, natural size, from Tepic. 
The ventral zone of the clitellum. 
The same more highly magnified, showing the papill# and prostate pores. 
The two penial sete in one sack. Zeiss D. Eyep., 2. 
The tips of the two penial sete. Zeiss 12, Eyep., 2, 1. 
BENHAMIA PALMICOLA. 
The ventral side of the anterior somites. 
The ventral region of the clitellum. 
A specimen, natural size. 
Penial sete. A. apex of the shorter sete. B. apex of the longer setw. C. two setw, whole. 
