PLATE XL 



SOLENASTR^A IIYADES (Dana). 



Fig. 80. — Transverse section througli tlii' upper part of a retracted polyp. .\t this level all the nie.«enteries extend 



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

 Fig. .si. — Transverse section through the stomoda;al region of the same polyji, showing the relationships nf the two 



orders of mesenteries and the septal invaginations. X 100. 

 Fig. 82. — Transverse section through the stomodaeal region of a bud polyp. The protocnemes are at the Edwardsian 



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



exocceles. X 110. 

 Fig. 83. — Oblicjue section of the same bud |)olyp, including the central peristome and the outer zone cif tentacles. ( )n 



the right side a tentacular i)rotuberance is already formed from the entoccele of the rudimentary pair 



of metacnemes (A). X 110. 

 620 



