PK.KORAL LOPK. j - i; 



came established between the nervous anil digestive 

 systems, known respeetively as the ,;;,'/,■;■,■<>;• ;md fosti-rior 

 lu-uriutifh- eanals. 



The posterior neurenterie eanal is onlv of transitory 

 oeeurrenee in all existing X'ertebrates, and leads from the 



/ :n n.-i T7< 



Fig. 131. — Oi.\gl\\nini.\Iic rcprcsent.i:ions ol \\\c anlorior ro^iion ol' Ihe bod\ 

 in \.-(\ .111 .\Si.-uli.ln l.irv.i, (.'<! l.irv.i ot .\iiipliio\us, .ind jc'l Ri\inoclossi!S. 

 (.\ftcr Wn LKV.") 



The fii^irc ot Ixil.inos^lossii^ w;l:^ conipilod rroni lA,ilo>on"s figures . Iho pro- 

 boscis-poro is indicated imiIkt 100 t.iv tonviirds. 



/.;', lV;vor;il lobo ^tixini; ori;.in, snout, proboscis'i. /-»;.;'. Endostvlc. t-.t-. Pi-.vonll 

 pit or proboscis-pore. ";. Mouth, v.*. Neuroporo. *?.-. Medullary tube. , ^;. Nou>- 

 chord. c. Eve. .V. Oiocisi. ,<.. .ind h. tVoboscis-gl.ind .ind proboscis-he.in ol 

 Rilanoglossus 



