CALIFUKNIA EUI)i;iLIl).K. 59 



DKI.TAXIA EI.KliANS, Figs. 4!)-r)(i. 



49. Thi' lumen and civral part of the nophiiiliiun in transverse section to the body. Jl. c. <:. flask-like f;hiuduhir 

 cells of elitolluui. hi. v. blood-vessels in thi' transverse muscular layer, t. m. transverse or circular muscu- 

 lar layer. /. m. longitudinal muscular layer. I. n. hunou of ccecal i)art of the nephridium. /. l. interior 

 lining of the nephridium. r/l, glandular outer layer of nephridium. ml. calculi projected liy the nephridnmi. 

 gt.r. glanilular cells of the clitellum. atr. urinary bladder or large contractile (?) chamber near the exterior 

 poi'e of the nephridium. m.i. muscular layer of the nephidial duct joining the tlask-like cells of the cKtel- 

 lum. col. collar of the nephridium forming the exterior pore and consisting of regular layers of largo, almost 

 rectangular cells. 



r>OA. Section through the body -wall and the lower part of a nepliriiliuni in somite xviii, but pcjsterior to the clitellum. 

 )i. fl. nephridio-duct. r. u. cci;cal nephridio-bladder. /. iii. longitudinal muscles, c. jh. circular muscles. 

 (•/). epidermis and cuticle. 



oOB. Section through the body-wall and the nephridial collar in a somite post<'rior 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 ccecal vesicle. 



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

 interior chamber or tubule, probably opening into the nephridial coecum. c. h. inner lining of the cwcal 

 bladder, jm. h. muscular layer of the bladder. c. n/i. collar of nephridium. ii. i/l. nerve ganglion. /. in. 

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



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



penial sacs with the prostate. p. s. s. penis sac with setas. p. s. one of the penial setiu broken. ///-. 

 and i>s. prostate and male-pore. ]]r. d. prostate duct. 



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



and prostate, and one of the penis sacs. «/). d. spermducts. j. up. junction of spermducts. pr. prostate. 

 j. sp. and pr. junction spermduct and prostate, s. pn. sac of penial setiB. _;. pr. and p. s. junction of prostate 

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

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



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



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

 I. VI. longitudinal muscles, i male-pore. atr. atrium, or junction between the penis sacs and the prostate. 



54. Section through the muscular part of the prostate. gl. inner glandular layer. »j. outer muscular layer. 



hlv. blood-vessels and cuticle. 



55. Section through upper end of prostate, blv. bloodvessels. <:. 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. rh. I. chloragogic layer. /. m. I. longitudinal muscular layer. e. I. 



vascular layer. Idr. blood-vessel of the epithelium, rp. 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. 



ARGILOPHILPS MARMORATIS ORNATOS, FigS. 59-1.30. 



59. A nephridium from one of the somites posterior to the clitellum. " o, inner orifice or uephridiostome engaged 



in the muscular dissepiment d. 1, narrow duct connecting the funnel with the fold. p. f. posterior 

 fold. a.f. anterior fold. u. upper part of the spongy duct, which at 15 stands in direct connection with 

 thenarrow tube 1. I. lower part of the sijougy duct gradually increasing in size towards 5. n. upper main 

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

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

 c. t. capillary tubules of the spongy duct. hi. blood-ve.-isels. cap. 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 tigure. 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 tyjje refer to those in rings on the plates. 



