TRIBE II. C ARYOPHYLLACE A. 361 



raro radiis circum aream mediant conspicuis ; laterum, scepiusque toti 

 coralli, texturd, spumoso-cellulosd. 



Quite simple or ramose Cyathophyllidse. Corallum not radiate, or 

 rarely with distinct rays about the central area ; texture of the sides 

 and usually of the whole corallum spumoso-cellular. 



The peculiar cellular structure of these species, may at once be 

 detected in the character of the lateral surface, especially after polish- 

 ing off the exterior, if not before, when the cellules will be found to 

 differ strikingly from the rectangular cellules of the Cyathophylla. 

 The species are usually without rays to the cells ; yet in some, faint 

 lines may be perceived around the central area, and a transition may 

 thus be traced to the Cyathophyllum structure. The absence of trans- 

 verse septa along the middle of the corallum has been laid down as 

 characteristic of the genus, yet it is not universal ; and we perceive 

 here, also, progressive transitions towards the Cyathophylla. 



II. SEPTIS TRANSVERSIS SUKSUM OBLIQUIS ET IN AXEM COEUNTIBUS. 



GENUS VIII. CLISIOPHYLLUM. DANA. 



CyathophyllidcB simplicissimrB, ramosce, aut aggregato-glomeratcK. Co- 

 rallum cellis radiatis, media interno septis sursum convergentibus ; axe 

 nullo; lateribus omnino cettulosis. 



Quite simple, ramose or aggregato-glomerate. Corallum having the 

 cells radiate, the middle within consisting of septa and cellules con- 

 verging upward, but without a distinct axis; texture exterior to this 

 middle portion cellular. 



This genus includes many of the so-called Cyathophylla, both 

 simple arid massive species. In internal structure they resemble the 

 Michelinise, but differ in having the structure minutely cellular exterior 

 to the central convergent portion. The bottom of the cell has usually 

 a conical prominence, proceeding from the character of the septa 

 within, and about this centre the lamellae sometimes appear twisted. 



91 



