PLATE XV T. 



DICHOCXENLA STOKES] -Milne Edwards and Haime. 



Fig. 117. — Transverse section through part of the upper region of a strongly retracted polyp, allowing how the discal 



tissues may be drawn downward within the polypal cavity, so as to form the so-called mesenterial 



funnels (c/. fig. 95a). (Seep. 434.) X 100. 

 Fig. lis. — Transverse section of the disk Lnvaginated between two mesenteries. The section is much lower than 



that from which the former figure was taken. X 100. 

 Fig. 1 19. — Transverse section through a small separate polyp with four pairs of complete mesenteries, none of 



which are directives, and four incomplete pairs. The septal invaginations are mainly entoccelic. The 



stomodseal ridges and grooves are well shown. X 100. 

 Fn;. 120. — Transverse section through a mesentery with complicated mesoglieal plaitings for the support of the 



retractor muscle. X 300. 

 630 



