No. 6.] THE MORPHOLOGY OF THE ACTINOZOA. 257 



above (Fig. i, DD), then somewhat obliquely, and below trans- 

 versely (Fig. I, A A). 



I have represented in Figs. 2-4 sections through the ciliated 

 bands at approximately the levels indicated in Fig. i by AA, 

 BB, CC, and DD. In Fig. 2 two mesenteries are shown, and 

 the section probably not having been perfectly transverse and 

 the amount of contraction not having been quite the same in 

 each mesentery, the filaments are cut at different levels, 2A 

 approximately at the level indicated by A A in Fig. i, and 2B 

 at the level indicated by BB. In 2A £he filament is cut almost 

 transversely. The free edge of the mesentery is occupied by 



—St 



Fig. 



— Diagram to sliow the relations of the ciliated bands, st =stomatodaeum ; A A and BB 

 = levels of sections shown in Fig. 2 ; CC = level of Fig. 3 ; DD := level of Fig. 4. 



a tolerably high epithelium which contains numerous clear 

 gland cells, probably mucous in character; the free edge of 

 the mesogloea is somewhat expanded to support this epithelium, 

 and, resting upon it, is a layer of very fine longitudinal muscle 

 fibers. Probably a layer of nerve fibers is also present, but I 

 could not be sure of it. From each side of the base of the 

 expanded edge of the mesogloea a strong wing-like lamella 

 arises, lined on the surface next the mesentery by endodermal 

 cells similar to those of the surface of the mesentery ; on the 

 surface turned away from the mesentery, however, the epithe- 

 lium is of a different nature. Nearest the free edge of the mesen- 

 tery it consists of cells, for the most part resembling ordinary 

 supporting cells (Stutzzellen), with an occasional gland cell, con- 

 taining numerous deeply staining granules, interposed. Towards 

 the free edge of the lamella, however, the cells are very slender, 



