THE ANATOMY OF THE MADREPORARIA. 31 



which the dark line in Lophohelia curves inwards to the ectoccelic 

 septum (owing to the fact that at the lip the latter does not project 

 so far peripherally as an entoccelic septum) agrees with the involution 

 of the septa in Flabellum. The fact that in Fig. 5 the centre of 

 calcification of the entoccelic septum projects outwards through the 

 line of growth, is of course attributable to the pseudo-costee occurring 

 at the lip of the calicle of this species of Lophohelia which are 

 produced by extra-calicular calycoblasts, and are not therefore repre- 

 sented in Flabellum. 



In Fig. 17 is drawn a transverse section through a part of the 

 pedicle, that is to say, a section through the corallum of an embryo 

 Flabellum measuring about 2'25 mm. in diameter, and possessing six 

 primary and six secondary septa. The relations indicated by the 

 sutures are the same as in the former section. The successive laminae 

 showing the conversion of the embryonic calyx into a nearly solid 

 pedicle are well marked. 



In conclusion, I have to express my thanks to Professor Milnes 

 Marshall for his assistance ; and to the anonymous donor of the 

 Berkeley Fellowships in the Owens College, whose generosity has 

 enabled me to carry on my studies. 



List of Memoirs Quoted. 



.1. Bourne, G. C. — "The Anatomy of Fungia," "Quart. Journ. 

 Micr. Sci.," xxxvii. 



2. Fowler, G. H. — "The Anatomy of the Madreporaria," I. 



" Quart. Journ. Micr. Sci.," xxv. 



3. Fowler, G. H.— " The Anatomy of the Madreporaria," II. 



" Quart. Journ. Micr. Sci.," xxvii. 



4. Von Heider, A.— "Die Gattung Cladocora," " Sitz. k. Akad. 



Wiss, Wien," lxxxiv. 



5. Von Heider, A.-" Korallenstudien," "Arb. Zool. Inst. 



Graz.," i. 



6. Von Koch, G. — " Bemerkungen liber das Skelet der Korallen," 



"Morph. Jahrb.,"v. 



7. Vox Koch, G.— "Mittheilungen iiber Colenteraten," "Jen. 



Zeitschr.," xi. 



8. VON Koch, G.— " Entwicklung des Kalkskelettes von Astroidcs 



calycularis," " Mittheil. Zool. Sta. Neap.," iii. 



