PLATE XII. 



SOLENASTR^A HYADES (Dana). 



Fig. 84. — Transverse section through the lower region of the same polyp as that from which figs. 80 and 81 are 

 taken. At this level the entocrelic and exocoelie septa are all fused in the middle to form the columella. 

 Twenty-four distinct loculi occur, each containing a single mesentery. The outer indentations of the 

 locular walls correspond with the strong granulations on the faces of the septa. X 100. 



Fig. 85. — Transverse section through a septal loculus, about the middle of the lengtli of the polyp. The filament of 

 the included mesentery is somewhat incipient in ciiaracter, not being sliarply separated from the 

 stomodical endoderm. The skeletotrophic endoderm is comparatively narrow, and the calicoblast layer 

 is well developed in places. X 300. 



Figs. 86-90. — Sections of a bud polyp takei' at different levels, representmg the order of appearance and relation- 

 ships of the mesenteries and septa. In tig. 86 two metacnemic pairs (A, A) have appeared within the 

 dorsal exocoeles. For fuller description see pp. 4.')6 and 499. X 100. 

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