CALIFORNIA EUDRILID^. 59 



OELTANIA ELEGAXS, FigS. 49-.')(i. 



4!). Thf lumen and cuh'hI part of the iiephridiuiu iu tniusverse section to the boily. /. .-. r. tlask-like glaudiilar 

 cells of clitelluiu. lit. v. lilood-vessels in the transverse mviscular layer. I. m. tniusverse or circular muscu- 

 lar layer. I. m. longitudinal muscular layer. /. n. lumen of ceecal part of the nephridium. (. I. interior 

 lining of the uepliridiuui. ijl. glandular outer layer of nephridium. i:al. calculi projected by the nephridium. 

 ril.r. glandular cells of the ditellum. air. urinary bladder or large contractile (?) chamber near the exterior 

 pore of the nephridium. ms. muscular layer of the nephidial duct joining the flask-like cells of the ditel- 

 lum. col. collar of the nci)hridium forming the exterior pore and consisting of regular layers of large, almost 

 rectangular cells. 



50A. Section through the body-wall and the lower part of a nephridium in somite xviii, but posterior to theclitellum. 

 n. d. nephridio-duct. r.. n. ctecal nephridio-liladder. t. m. longitudinal muscles, n. m. circular muscles. 

 ep. epidermis and cuticle. 



50B. Section through the body-wall and the ncphridial collar in a somite posterior to the clitellum, illustrating the 

 large ganglion (?), below the nephridial collar. The section shows the beginning of the nephridial collar and 

 the place where it joins the ctecal vesicle. 



50C. Section closely following the former nearer the nephridio-pore, showing a larger part of the ganglion, i. c. 

 interior chamber or tubule, probably opening into the nephridial <ucum. v.h. inner lining of the ciecal 

 bladder, m. b. muscular layer of the bladder. c. iiji. collar of nephridium. u. ;//. nerve ganglion. /. m. 

 longitudinal muscular layer of the body-wall. I. m. transverse layer of the body-wall. h. hypodermis. 



51. Lower part of the prostate and penial sac, section through the male-pore, showing the junction of one of the 



penial sacs with the prostate. //. s. .<. penis sac with setie. ji. s. one of the penial seta" broken. pr, 

 and /).s'. jirostate and male-pore. pr. d. prostate duct. 



52. Section through the male-pore, cross-section through the body-wall, showing junction of the two spermducts, 



and prostate, and one of the penis sacs. sp. d. spermducts. j. xp. junction of spermducts. pr. prostate. 

 j. sp. and ;:)r. junction spermduof and prostate, s. ps. sac of penial setiB. j. pr. and p. s. junction of prostate 

 and penal setse. S male-pore. cp. epidermis, c. m. layer of circular muscles, body-wall. I. m. layer of 

 longitudinal muscles, body-wall. ». c. nerve cord from ventral ganglion, /i. p. penial papilla. 



53. Section through the male-pore showing junction of the two penis sacs with the prostate, /is. the two 



branches of the penis sac with the penis sheaths and penial setie. pr. prostate. c. m. circular muscles. 

 I. m. longitudinal muscles. A male-pore. air. atrium, or junction between the penis sacs and the prostate. 



54. Section through the muscular part of the prostate. f/l. inner glandular layer. m. outer muscular layer. 



hlv. blood-vessels and cuticle. 



55. Section through upper end of prostate, hlr. bloodvessels, c. r. vessels between the inner and outer layer of 



cells, i. V. inner capillary vessels, lining the inner surface of the prostate. 



56. Section through prostate at the junction of the muscular and glandular part. m. pr. muscular prostate; other 



letters same as in Fig. 54. 

 57A. Section through intestine in somite xv. <A. /. chloragogic layer. /. m. I. longitudinal muscular layer. v. I. 



vascular layer. Idr. blood-vessel of the epithelium, cji. epithelial layer. 

 57B. Section through intestine, somite xiv. 

 57C. Section through intestine, somite xvi. 



58. Cross-section through the clitellum, showing the relative size of the various layers. 



AKGILOPIIILnS MARMORATIS ORNATUS, FigS. .'lO-l.'iO. 



59. A nephridium from one of the somites posterior to the clitellum. * o, inner oritice or uephridio-stome engaged 



iu the muscular dissepiment d. 1, narrow duct connecting the funnel with the fold. /). /. posterior 

 fold. a./, anterior fold. ii. upper part of the spongy duct, which at 15 stands iu direct connection with 

 the narrow tube 1. I. lower part of the spougy duct gradually increasing iu size towards 5. a. upper main 

 canal, b. lower main caual, both the upper and the lower being different ends of the same canal, o. c. f- 

 point of recurrence, p. c. peritoneal cell covering or support of the nephridium. n. p. nephridio-pore. 

 c. t. capillary tubules of the spongy duct. bl. blood-vessels, rap. capillary blood-vessels surrounding the 

 canals a and h. 1 to 17 mark places from which the detail drawings are taken. The nephridium is longer in 

 proportion to its thickness than what is shown in the figure. If the part between the two parallel lines at 

 18 was increased to about one-third or one-fourth the entire length of the nephridium the proportion would 

 be correct. If the whole nephridium had been drawn the figure would have been too long for the plate. 



60. Nephridio-stome, front view. 



61. Nephridio-stome, side view. 



62. Nephridio-stome, end view. 



' Letters and figures in full-face type refer to those in rings on the plates. 



