l.sd (;ai.iii>i;ma .mahkm y ok sciences. 



PLATE XLVIII. 



BENHAMIA NANA. 



.'{6. Section through one of the prostate pores, showing prostate, sac with penial seitm and the thickened spermduct. 

 X. at this point the clitelhir cells cease, c. I. connective tissue between the two muscular layers. 



.^7. Cross-section of the thickened part of the spermduct, showing the two lumens separate. 



SS. Section through the muscular part of the prostate, showing the epithelium and some of the muscles nearest 

 the lumen. 



S9. One of the posterior nepliriilia; the shaded sac-like part represents the ccelomic mantle. It is generally co\ ered 

 with capillaries to such an extent that the structure of the organ is obscured, hr. bridge, nee. neck of nar- 

 row duct, spr. spur. 0./. anterior fold. />./. posterior fold. 



40. One of the anterior nephridia, showing absence of ccelomic glands, also the arrangements of blood vessels. 



41. Part of the nephridium more magnified. No capillaries are represented. 



42. Part of culomio mantle of one of the posterior nephridia. se. secreted matter staining very deep. «. nuclei of 



the glandular cells. 



BENHAMIA PAPILLATA. 



4.S.\. A specimen, imturiil size, from Tepic. 



4.')B. The ventral zone of the clitellum. 



43C. The same more highly magnified, showing the pnpilhe and prostate pores. 



4.30. The two penial setif in one sack. Zeiss D. Eyep., 2. 



43E. The tips of the two penial setu-. Zeiss 12, Eyep., 2, I. 



BENHAMIA PALMICOLA. 

 44A. The ventral side of the anterior somites. 

 44B. The ventral region of the clitellum. 

 44C. A specimen, natural size. 

 4.T. Penial setie. A. apex of the shorter setiu. B. apex of the longer seta). C. two setif, whole. 



