ISU CAI.IKOKNIA ACADEMY OF SCIENCES. 



PLATE XLVIII. 



BENHAMIA NANA. 



.S6. Section through one of the prostate pores, showing prostate, sac with penial setae and the thickened spermduct. 

 X. at this point the clitellar cells cease, c. i. conuectiTe tissue between the two muscular layers. 



37. Cross-section of the thickened j)art of the spermduct, showing the two lumens separate. 



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



the lumen. 



39. One of the posterior nephridia; the shaded sac-like part represents the coelomic mantle. It is generally covered 



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

 row duct. s;:ir. spur. o./. anterior fold. p./. posterior fold. 



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



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



42. Part of ctelomic mautle of one of the posterior nephridia. se. secreted matter staining very deep. n. nuclei of 



the glandular cells. 



BENHAMIA PAPILLATA. 



4.3.\. A specimen, natural size, from Tepic. 



43B. The ventral zone of the clitellum. 



43C. The same more highlj' magnified, showing the papillse and prostate pores. 



43D. The two penial setit in one sack. Zeiss D. Eyep., 2. 



43E. The tips of the two penial setie. Zeiss 12, Eyep., 2, 1. 



BENHAMIA PALMICOLA. 

 44.\. The ventral side of the anterior somites. 

 44B. The ventral region of the clitellum. 

 44C. A specimen, natural size. 

 45. Penial setie. A. apex of the shorter setie. B. aj^ex of the longer setse. C. two set.-v, whole. 



