4 3 4 



V\n. 27 'rran.svcisc soc/tiim uf an (.■riilirj-u (if i.'iylil sciiiiik's, Ciiluuibia Co 

 tiim .VKI, slide 7, row 4, scctioii (. X :{(!(). Uoduccd ]. 



1 Aorta 



2 Coeloin 



3 ( )tii|iliMl(iirirsoiitpri(' |)li'xiis 



4 Projections of iiicsoderiii between 

 blood vessels 



SO 



