The Anatomy of the Madreporaria : III. 



By 



G. Herbert Fowler, B.A.Oxon., Ph.D., 



Berkeley Fellow of the Owens College, Manchester. 



With Plates I, II. 



The present memoir deals with the anatomy of Turbinaria 

 (p. 1), a colonial Perforate coral-; of Lophohelia (p. 6), 

 an Imperforate form, colonial hut with separate calyces ; and of 

 the two aberrant Imperforate genera, Seriatopora (p. 10) 

 and Pocillopora (p. 13), 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 Hexactinise 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 pre- 

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

 Professor H. N. Moseley, who procured the material during 

 the voyage of H.M.S. "Challenger." 



i. Corallum. — The colony is crateriform or goblet shaped, 



VOL. XXVIII, PART 1. NEW SER. A 



