(;2 CAMFOUNiA acadp;my ok sciencks. 



II.'). Cross spi-tion tlirough clitellnin. ;//. Kliin<Uilftr cells with fine secretions, r. .//. (•Ifinds from tlie liypoilcrniis 



priijoetiM}' into the (ornicr layer, hi. v. hloml vessels. 

 110. Detail of the former, illnstraliny the hypoileriual inlands, etc. 



117. Cross section tliron'jh 1. oily-wall, somite xii. Lt-tters same as above, illustrating the arrangement of the 



lonnitniliual muscle.s. k/iU. sperniihict. 



1 18. Cross section through body-wall somite xvii, ilhistratiny the transverse mnscles. 



Il>l. Somite xiv laid open, illustrating the diagonal muscular baud. oiv/. oviduct. «. septum xiii xiv. or/), ovi- 

 pore. i. -'..?. ^. sette. m.l.^'.S. diaKOual muscular band, beginning and ending on the body-wall. 

 HI. .',. muscular band connecting the oviduct and septum with the Imdy-wall. n.f. nephridio-fnuuel. 

 w. (/. intersegmental groove. i\ d. ventral blood-vessel. A. ventral part of the hearts. I. v. lateral vessel 

 spreading on the body-wall and supplying the uephridiuni. r. ;/. ventral ganglion. 



I20A. Cross secliion through one of the ventral jiapill* of Argilophilus maruioratns pai>illifer. /. r. tubular cells 

 butting on the central glandular masses, c. r/l. supporting and protecting cells, with coarse grainy con- 

 tents. A. common supporting cells of the hypodernial layer. /. m. longitudinal muscles. I. m. trans- 

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

 ventral nerve ganglion, o. glandular papillic with central nerve ganglia. 



120B. The corresponding organ, or ventral papilla in Argilophilus marmorutus oruatus; letters indicate the same. 



121 A. Detail of the last figure showing the most lateral of the glandular masses, o. glandular mns.ses with a 

 central nerve ganglion. 



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



122. One of the common setof. 



123A. One of the peuial sette. 



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 seta) and the nephridio-pores over a certain space. 1, ,?, 3, 4, the various rows of seta?, np. p. 

 uephridio-pore.s, 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, 128. The anterior part of the body seen from the ventral side. Various specimens to show the 

 variation in position and number of the ventral piipilhe. .i/j/h. spermathecal-pores. ovil. oviducts. 

 ' male-pores. The ovals indicate the ventral papilhe. 



l2f).V. 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. /). s. peuial seta> protruding 

 from the male-pores. 



I2H15. The twenty-three anterior somites of a specimen killed in alcohol gradually increased iu strength and hardened 

 in strong alcohol, showing the spermatheeal, 9 and ? pores, the ventral pai)ill.-p, etc. 



1290. The most anterior somites seen from above. 



i:iO. The two and three anterior somites of two diflereut specimens, showing the inverted bnccnlic sac, the prosto- 

 mium, etc. a. and r. ventral; r. <l. niu\/. dorsal; i . lateral view. 



.AKOII.OI'niI.rs MAKMOR.4TUS PAl'il.I.IFKR, Figs. l.'il-l.'!(i. 



LSI. The anterior somites viewed from below showing the single row of ventral papilhe, diminishing in size an- 

 teriorly. The outlines at the side represent the shape of thepapillie ns found in the figured specimen. 



i:t2.\. A medium size specimen preserved iu strong alcohol. The specimen was first killed in au increasing solu- 

 tion of corrosive sublimate. 



i:i2U. A large specimen of the former figured while alive. 



\Xi. Section of the intestine and dorsal vessel in somite ix, in order to show the typhlosolar vessel. /. r. lyphlo- 

 golar vessel in the intestine. (/. r. dorsal longitudinal vessel. cA. <•. chloragogic cells of the intestine. 

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

 epethelial lining. 



134. The typhlosolar region of the intestine, detail from the last figure more highly magnified. /. r. typhlosolar 



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

 letters as in the last figure. 



135. C!ross section of the intestine ami dorsal vessel in somite xxiv illustrating the typhlosole. .«. i. sacculatetl 



intestine, hi. ». blood-sinuses. Ii/. typhlosole. 

 130. Detail of the former, showing the typhlosole proper, greatly magnified. </. r. doi-sal vessel. /;/. typhlosole. 

 01. r, blood sinuses in the intestine. /. »;i. longitudinal muscles. .•. m. and < . /•. circular musules nud 

 epithelial lining of the intestine. 



