(27) 



into the enteric cavity ia correct, then Maste riiian* s and Lorii^- 

 charaps's use of ti^-s word is incorrect.) 



Masterman speaks of a "sli^^ht ridi^e" runnin.-; around tne 

 edge of the preoral iaood ana tiien "do'.vnvvards till it is lost 

 on the surface of tr.e tentacles". Such a rid^e is not pres- 

 ent in th.e larva of Phoronis arcnitecta and there is no con- 

 nection between the ciliatea tract alon^ the line o-^ v/hicl-: tl^e 

 larval tentacles arise and ti:c ciliated ed^^e of the preoral 

 nood. 



At this stare ('Pi.;i.24) a definite intestinal canal is seen 

 'Which, however, does not open yet to the exterior. The in- 

 testine, as described above, is not of ectoderriial origin in the 

 larva o •'^ Phoronis architecta. There is no pro ctodaouin. On 

 this point, my observations agree v.-ith tiiose of ''Jaste rnran, Long- 

 champs aiid Ike da. 



Roule (20) says: "Un anus et rcct^mx se fa^onnent, aux de- 

 pens de I'ectoderm, sur I'extremite poste'rieure du corps." 

 (Page 102) aiid Caldv/ell (3a) derives ti.e intestine from the 

 remaiTis of the "primitive streak". 



As yet the anal papilla is not at all definite but the 

 ciliated band blon,^ which tne larval tentacles are to arise 

 has now appeared. This is indicated in the sagittal section 

 ( "Pig. 24) by a thio;kenin;_, of tne ectoderm. 



