310 THE PROCEEDINGS OP THE LINNEAN SOCIETY 



This coral is distinguished by the small number of cycles (in 

 which respect it resembles Paracyathus crassus, Ed. and H.) by 

 the depth of the calice, and the septa being so slightly salient, 

 which makes the columella a very prominent feature. It is more 

 like the fossil species than any at present living. In this speci- 

 men one half the cup is covered and obliterated by a silvery 

 Millepore (?) 



Second Division Flabellace.e. 



Wall entirely covered by a pellicular epitheca. 



Qemis Flabellum, Lesson, 1831. 



Corallum simple, straight, compressed ; calicular fossa narrow 

 and deep ; columella represented by a few spiniform processes on 

 the internal edge of the septa ; the latter numerous and sub- 

 equal, so that the cycles and systems are very difficult to dis- 

 tinguish ; they belong to six primitive systems ; they are 

 not exsert, and have well-marked radiated series of granules, the 

 wall often furnished with crests or spines. M. Edwards adds 

 that they never have radiciform processes. 



Flabellum spinosum, M. Ed. fy H. 



Corallum much compressed, deltoid, of somewhat less than a 

 right angle, and bearing on each edge, about the middle, a long, 

 stout spine which is projected outward and downward ; the ends 

 of the greater axis of the calice depressed one-third of the 

 height ; septa thin, in five cycles, the three first of which are 

 equal and the fifth rudimentary. Alt. 13, major axis 16 J, minor 7 

 mil. 



Princess Charlotte's Bay. It has also been found in the China 

 Seas. Said to occur also at Moreton Bay. 



Flabellum affine, M. Edw. Sf H. 

 Corallum adherent in its young state but becoming subse- 

 quently detached, and having a large basilar scar ; very much 

 compressed, the lateral edges being simple, slightly concave, and 

 forming an angle of about 65° ; lateral outline of the calice very 

 convex, so that the slightly angular edges of the greater axis are 



