470 



Prof. J. E. Diicidcn on the 



Transverse section through the stomodseal region of a polyp. An intra- 

 polypal tentacle is seen in section within the dorsal directive entoccele 

 and one within the exocoele on each side of it. The mesenteries 

 in the genus Pucillopora are only in the J^dwardsia-sta^e of 

 development, i. e. four pairs complete, two pairs incomplete. The 

 stomodaeal wall of retracted polrps frequently presents, as here 

 represented, a cruciform appearance in transverse sections. 





Ficr. 4. 



Transverse Bection through the stomodaeal region of a retracted polyp 

 ■with only one intrapolypal tentacle, which is situated within the 

 exocoele to the right of the dorsal directive entoccele. The presence 

 of the intrapolypal tentacle has disturbed the regularity of the 

 mesenteries and stomodseum in the retracted condition. 



