Morphology of the Madrepore 



107 



two mesenteries, and that these effect a union with the vertical 

 bofly-wall, is clearly shown in the series of partly diagram- 

 niatic transverse sections (fig. 8, A-D)^ taken at different 



/• / 



Fig. 8. 



Diagrammatic fignres taken at different levels from a smgle polvp to 

 illustrate the manner in which a single mesenterial strand joinin"- 

 two stoinod<eal tubes becomes inserted on the pol_ypal wall as a pair 

 of distinct mesenteries : ^ is towards the inner termination of the- 

 stomodpeum, D is from the npper extremity of the polyp, and B and 

 Cfroni intermediate sections. 



levels from a single polyp. Fig. A is from a section tlirough 

 the lower stomodteal region, where only a single straight 

 mesentery joins the two stomodieal tubes. The dorsal 

 connecting- mesentery is already divided, and presumably 

 is represented by the two mesenteries, e, e (cp. fig. 5). In 

 fig. B^ taken from a section a little higher, the connectino- 

 mesentery is directed in an angular manner toward the dorsal 

 part of the body-wall, and in the next it is actuallv inserted 

 on the wall ; while in the last figure {D^, from a section near 

 the upper extremity of the polyp, the two halves are alto- 

 gether apart and appear as two distinct mesenteries, /, /". 



