58 CALIFORNIA ACADEMY OF SCIENCES. 



10. One of the septal glauds in somites vi, vii, viii aud ix. 



11. Ciliated rosettes. 



12. Ovary. 



13. Spermatheca. 



14. Exterior male-pore and penial papillip. .5 male-pore. p. s. penial setis and papilla. 



15. Exterior view of the clitellum seen from the ventral side. op. ovipore. i male aud prostate pore. 



16. One of the regular seta?. 



17. Penial seta' from somite xvii. 

 IS. Testis from somite x. 



19. Nephridium from somite xv. 



20A. Anterior nephridium from somite ii. 



20B. A uephridio-stome from one of the posterior nephridia. 



DELTANIA TROYERI, FigS. 21-38. 



21. Diagramatic view of the regular arrangement of the seta? in several somites jjosterior to the clitellum. 

 22A. A medium size worm. 

 22B. The largest specimen. 



23. The anterior part seen from above, showing prostomiiim and somites i, ii, iii. 



24. Schematic view of the arrangement of the inner seta; in the region on both sides of the male-pore. ovp. ovi- 



pore. p. .«. penial setfe. i male-poi'e. 



25. The outside of the male genital region. /. folds in the body-wall. p.s. penial seta?, p.p. penial setae papilla. 



pr. aud i5 prostate and male-pore. c. d. cupshaped concave region or sucker near the male-pore. c. c. 

 central cavity between the male-pores. ?n. st. place for missing setie No. 1. s. st. seta No. 2. p. m. penial 

 muscles, arranged fanshaped, connecting the male-pore with the intersegmental groove. 



26. Longitudinal section of the anterior part of the body. h. r. buccal cavity, phnx. pharynx, si. gl. salivary or 



phar3-ngeal glands, br. brain, s. gl. septal glands, s. pie. sigmoid plexus of the cesophagus. sp. s. sperm- 

 sacs, ces. cesophagus. t. testes, xpih. spermatheca. 



27. Somewhat schematic view of the alimentary canal seen from above, te.-:. cesophagus and pharynx, si. gl. 



salivary gland, s. gl. septal gland. </. v. dorsal vessel, h. hearts, t. i. tubular intestine, s. i. sacculated 

 intestine. 



28. Brain and ventral ganglion. 



29. One pair of the sejital glands (vi). 



30. Spermatheca from ix. Side view. 



31. Spermatheca seen from below. 



32. Spermatheca seen from above. 



33. Male apparatus, pr. prostate, p.s. penial sacs aud setse. sp. d. spermduot. ms. muscles of the body-wall. 



34. Nephridium from somite xv. 



35. Oviduct and ovisac, left side. 



36. The same from the same individual, but from the right hand side of the ventral ganglion. 



37. The same sac seen from above. 



38. Detail of the same. 



39. Arrangement of the seta' surrounding the spermathecal pores. 



DELTANIA EENIIAMI, FigS. 40-48. 



40. Arrangement of the setse surrounding the spermathecal aud male-pores. The same proportion and scale as in 



the preceding figure. 



41. Sperm -sac. 



42. Spermatheca, left side. 



43. Spermatheca, right side of the same individual. 



44. Oviduct. 



45. Prostate gland aud penial setiP. v. v. blood vessel covering the prostate. 



46. Alimeutai'y canal, phx. pharynx, sl.gl. salivarj' glands, s. gl. septal gland, ces. cesophagus. s. i. saccu- 



lated intestine, c. i. contracted part of the intestine generally commencing somewhere between somites xxvii 

 to xxxvi and continuing towards the tail. In the fust six somites the contraction is generally much narrower 

 than in the following. 



47. The worm natural size. 



48. The male papilla- on somite xvii, showing the projecting penial seta:". The upper shaded part is the clitellum 



proper which ends at the center of the somite in line with the male-pore. 



