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Explanation of Figures, 



Abltrcviations: 



bt.v., blood vessel; ms., mesoderm; 



ca., clear area of nuclcus; ms.c, mesodermal cell; 



c.g., cerebral ganglia; mus., niuscle; 



cid., chlorogogue; ncL, nucleus; 



cm., circular muscle; ncls., nucleolus; 



cm.c, ch'cular muscle cell; ne., neoblast; 



c>/., cytoplasm; ne.c. neoblastic cell; 



ed., ectoclerm; ne.ect., neoblasts and ectoderm; 



i.nius., intestinal muscle; nv., nerve; 



iid., intest ine; pm., peritoneam ; 



Im., longitudinal nuiscle; fr.c, primordium of cerebrum ; 



hn.c, l(mgitudinal muscle cell; pr.nv., primordia of ventral nerve; 



m., mouth; stm., septum; 



tn.c, metamorphosed celis; spm., pseudoproctodaeum ; 



m.ect., metamorphosed ectoderm; st., Strand; 



mis.c, miscellaneous cells; .s-^.c, stnxnd cells; 



mn.c, migrating neoblast cells; o.lm., ventrolateral bands of longitu- 



m.pn., muscle and peritoneal cells; dinal muscle. 



Except wliere otherwise stated the figuies are taken from sections of Tiibifex. 

 Most of the figures are drawings made with the aid of an Abbe camera lucida and 

 Zeiss oculars and objectives. Where stipling has been used to show differences 

 in the character of the ectoderm cells the limits of the changed area have .been 

 made more abrupt than is really the case. The change is most marked in the 

 stippled area. In a few cases photographs were made of sections which could not 

 be otherwise reproduced with sufficient accuracy. The magnification of each 



