THE ANATOMY OF THE MADREPORARIA. 



III. 



By G-. Herbert Fowler, B.A., Keble Coll. (Oxon), Berkeley Fellow of 

 the Owens College, Manchester. 



[With Plates II. and III.] 



The present memoir deals with the anatomy of Turbinaria (p. 17), 

 a colonial Perforate coral ; of Lophohelia (p. 22), an Imperforate form, 

 colonial but with separate calyces ; and of the two aberrant Imper- 

 forate genera, Seriafqpora (p. 25) and Pocillopora (p. 28), in which the 

 calyces are merged in ccenenchyme. To these descriptions is appended 

 a note on the skeleton of Flabellum. 



The most important facts now described for the first time are — 

 1. The absence of directive mesenteries in Lophohelia, which thus 

 differs from all Hexactiniae hitherto described. 2. The retraction 

 of the tentacles of Seriatopora by introversion, of which no other 

 instance is known among the Madreporaria. 3. The presence of 

 centres of calcification in the theca. 



As in previous memoirs (2, 3), I have endeavoured to let the 

 figures speak for themselves rather than to give detailed descriptions 

 of structure. 



Turbinaria, sp. (Figs. 1-3). 



For the opportunity of investigating this form, as in previous 

 instances, I am indebted to the liberality of my teacher, Professor 

 H. ,\. Moaeley, who procured the material during the voyage of 

 II. M.S. "Challenger." 



