CONKLIN, ACTINIAN LARV/E 



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Trnnsversc sections of Zoanlhclla 3.S mm. long and 1.2 mm. wide. PhotomicrOKraphs by H. G. Kribs, lalten wltli monochromatic 

 blue liglit of 448 fx wave-length. x7S. 



Fig. 12. Section through the oral rceion, showinir endoderm filling the coelentcron ; at this stage the mouth Is imperforate and the 



pharynx has not formed. 

 Figs. 13-17. Sections through the region of the open coelcnteron ; the ciliated band Is plainly divided down the middle. 

 Fig. 18. Section through the aboral region, showing the spongy endoderm titling the entire coelenleron. At various places cells 



are seen In the mesogloea. 



