58 CALIFORNIA ACADKMV OF SCIENCES. 



10. Ouc of the septal gliiuilK iu soiuite-B vi, vii, viii niul ix. 



11. Cilintod rosettes. 



12. Ovary. - 



13. Sperniathecn. 



14. Exterior male-pore and peiiial papilln>. ! male-pore. /<. ». peiiial set«- and papilla. 



\r>. Exterior view of the clitelliim seen from the ventral side. o;/. ovipore. J male and prostate pore. 



10. One of the regular seta'. 



17. Peuial set.-C' from somite xvii. 



18. Testis from somite x. 



19. Nephridiuiii from somite xv. 



'J0.\. Anterior nepliridiiim from somite ii. 



•JOU. A uephridio-stome from one of the posterior nephridia. 



DKLTAXIA TKDVEEI, FigS. 21-.38. 



■Jl. niaf;raniatic view of the regular aiTaugcmeut of the setu' in several somites posterior to the clitelhnu. 



'J'JA. A medium size worm. 



22B. The largest specimen. 



2.1. The anterior part seen from above, showing prostomium and somites i, ii, iii. 



24. Schematic view of the an-augemeut of the inner setro in the region on both sides of the male-pore. o»/y. ovi- 

 pore. /). .«. penial setiv. i male-pore. 



2.>. The outside of the male genital region. /. folds iu the body-wall. p. s. penial seta>. ]>.}>. penial seta? papilla. 

 ]ir. and .; prostate and malo-pore. r. d. cupshaped concave region or sucker near the male-pore. r. r. 

 central cavity between the male-pores, m. st. place for missing seta) No. 1. ». st. seta No. 2. //. m. penial 

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



20. Lougitndinal section of the anterior part of the body. b. c. buccal cavity, phnx. pharynx, xl. gl. salivary or 

 pharyngeal glands, br. brain, s. ijl. septal glands, s. plit. sigmoid plexus of the oesophagus, sp. «. sperm- 

 sacs, as. (esophagus, t. testes, upth. spermatheca. 



27. Somewhat schematic view of the alimentary canal seen from above, les. oesophagus and pharynx. «/. ;//. 



salivary gland, k. ijl. septal gland. </. c. dorsal vessel. A. hearts. I.i. tubular intestine, s.i. sacculated 

 intestine. 



28. Brain and ventral gaugliou. 



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



30. Spermatheca from ix. Side view. 



31. Spermatheca seen from below. 



32. Spermatheca seen from above. 



33. Male apparatus, pr. prostate, ji.s. penial sacs and seta>. sp. it. spermduct. m)>. muscles of the body-wall. 



34. Nephridium from somite xv. 



35. Oviduct and ovisac, left side. 



.30. 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 setaa surniunding the spermathecal pores. 



DELTANIA IIKNIIAMI, FigS. 40-48. 



40. Arrangement of the setaj surrounding the spermathecal aiul mali -pons. 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 and penial setii'. v. v. blood vessel covering the prostate. 



40. Alimentary canal, /ihx. pharynx, sl.ijt. salivary glands. ».(//. septal gland, ifs. resophagus. «. 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 lirst six somites the contraction is geuemlly much narrower 

 than in the following. 



47. The worm natural size. 



4K. The male papillii' on somite xvii, showing the projecting pi'uial seta\ The upper shaded part is tin- clitellum 

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



