62 CALIFORNIA ACADKMY OF SCIENCES. 



11"). Cross section through clitellum. c/l. glaudular cells with tine secretions. <■. ;/!. glands from the lij-podermis 



projecting into the former layer, hi. v. hlood vessels. 

 IKi. Detail of the former, illustrating the hyiiodermal glands, etc. 



117. Cross section through body-wall, somite xii. Letters same as above, illustrating the arrangement of the 



longitudinal muscles, spd. spermduet. 



118. Cross section through body-wall somite xvii, illustrating the transverse muscles. 



im. Somite xiv laid open, illustrating the diagonal muscular band. o?^fi. oviduct, s. septum xiii xiv. 017). ovi- 

 pore. /. 3. 3. 4. setse. m. 1. .?. .?. diagonal muscular band, beginning and ending on the body-wall. 

 m. Jf. muscular band connecting the oviduct and septum with the body-wall. ».,/'. nephridio-fuunel. 

 !.f. 3. intersegmental groove. c. d. ventral blood-vessel. A. ventral part of the hearts, l.r, lateral vessel 

 spreading on the body-wall and supplying the nephridium. r. ij. ventral ganglion. 



120.\. Cross section through one of the ventral papilla- of Argilophilus marmoratus papillifer. I. c. tubular cells 

 butting on the central glandular masses, c. (jl. supporting and protecting cells, with coarse grainy con- 

 tents, h. common supporting cells of the hypodermal layer. I. m. longitudinal muscles, t. m. trans- 

 verse muscles, v. I. inner vascular layer, nf. nerve ganglions, connecting the glandular masses with the 

 ventral nerve ganglion. 0. glandular papillas with central nerve ganglia. 



r20B. The corresponding organ, or ventral papilla in Argilophilus marmoratus ornatus; letters indicate the same. 



121 A. Detail of the last figure showing the most lateral of the glandular masses. 0. glandular masses with a 

 central nerve ganglion. 



121B. Detail of the same figure showing the most centrally located glands. 



122. One of the common set;e. 



123A. One of the penial seta?. 



123B. The tips of the former more highly magnified. 



124. A part of the body-wall viewed from the inner side. A semi-diagramatic figure illustrating the arrangement 

 of the setiie and the nephridio-pores over a certain sijace. i, .•', .?, 4, tlie various rows of seta?, np. p. 

 nephridio-pores, indicated by round circles. Two of the nephridia are drawn in order to show their position, 

 as well as the relative size of the ducts. 



12."), 12(), 127, 12s. The anterior part of the body seen from the ventral side. Various specimens to show the 

 variation in position and number of the ventral papilliB. apth. spermathecal-pores. ovd. oviducts. 

 ? male-pores. The ovals indicate the ventral papilla?. 



129.\. The clitellar and some of the anterior somites, viewed from the ventral side, showing the various pores and 

 the genital zone. Letters indicate the same as in the preceding figures, p. ,«. jjenial setip protruding 

 from the male-pores. 



129B. The twenty-three anterior somites of a specimen killed in alcohol gradually increased in strength and hardened 

 in strong alcohol, showing the spermathecal, ? and >5 pores, the ventral papilla', etc. 



129C. The most anterior somites seen from above. 



1.30. The two and three anterior somites of two different specimens, showing the inverted buccalic sac, the prosto- 

 mium, etc. a. and <■. ventral; r. d. audy". dorsal; e. lateral view. 



ARGILOPHILUS MARMORATUS PAPIlLIFER, FigS. ISl-l.'JG. 



l.ll. The anterior somites viewed from below showing the single row of ventral papilla>, diminishing in size an- 

 teriorly. The outlines at the side represent the shape of thepapilL-v as found in the figured specimen. 



1.32A. A medium size specimen preserved in strong alcohol. The specimen was first killed in an increasing solu- 

 tion of corrosive sublimate. 



132B. A large specimen of the former figured while alive. 



133. Section of the intestine and dorsal vessel in somite ix, in order to show the typhlosolar vessel. /. r. typhlo- 



solar vessel in the intestine, d. v. dorsal longitudinal vessel, ch. r. chloragogic cells of the intestine, 

 e. p. epithelial folds of the inner lining, void of chylus glands, r. i\ the chylus region of the inner 

 epethelial lining. 



134. The typhlosolar region of the intestine, detail from the last figure more highly magnified. I. !'. typhlosol.ar 



lining. /. m. longitudinal muscles of the intestine, r. ni. circular muscular layer of the same. Other 



letters as in the last figure. 

 1.35. Cross section of the intestine and dorsal vessel in somite xxiv illustrating the typhlosole. s. i. sacculated 



intestine, bl. s. blood-sinuses, ti/. typhlosole. 

 13ti. Detail of the former, showing the typhlosole proj^er, greatly magnified. d. r. dorsal vessel. I.i/. typhlosole. 



bl. r. blood sinuses in the intestine. /. m. longitudinal muscles, r. m. and r. p. circular muscles and 



epithelial lining of the intestine. 



