PLATE XL 



SOLENASTR^EA HYADES (Dana). 



Fig. 80. — Transverse section through the upper part of a retracted polyp. At this level all the mesenteries extend 



from the thecal wall to the inturned column wall. X 100. 

 Fig. Ml. — Transverse section through the stomodseal region of the same polyp, showing the relationships of the two 



orders of mesenteries and the septal invaginations. X 100. 

 Fig. sl». — Transverse section through the stomodieal region of a bud polyp. The protoenemes are at the Edwardsian 



stage of development, and a pair of metacnemes (A, A) has appeared within each of the middle primary 



exocceles. X 110. 

 Fig. 83. — Oblique section of the same bud polyp, including the central peristome and the outer zone of tentacles. ( in 



the right side a tentacular protuberance is already formed from the entocoele of the rudimentary pair 



of metacnemes (A). X 110. 

 620 



