INTRODUCTION. Ixv 



Family XIII. 

 CYATHAXONTD^E. 



Corallum with well-developed, complete septa, which extend without interruption from 

 the bottom to the top of the visceral chamber, and not forming a regular radiate circle • 

 those of the primary cyclum not much larger than the others, and not forming a four- 

 branched cross, as in the Stauridae ; one well-characterised septal fossula. No dissepiments 

 nor tabulae. 



Genus Cyathaxonia. 



Michelin, Icon. Zooph., p. 258, 1846. 



Corallum simple. Calice deep. Columella styliform, strong, and very prominent. 

 Septa extending to the columella ; the place of one of them occupied by a deep depression 

 or septal fossula. 



Typ. sp., Cyathaxonia coma, Michelin, loc. cit., p, 258, pi. lix, fig. 9. 



Family XIV. 

 CYATHOPHYLLID.E. 



Corallum with incomplete septa, that do not extend from the bottom to the top of the 

 visceral chamber, in the form of uninterrupted laminae ; those of the primary cyclum similar 

 to the others, and not forming a central four-branched cross. Septal fossulae varying in 

 number and in size. Visceral chamber divided by a series of superposed tabulae. 



First Tribe— ZAPHRENTIN^E. 



A single septal fossula, well developed, or replaced by a sulcus or a crestiform process, 

 and occasioning more or less irregularity in the radiate arrangement of the septal, apparatus. 

 The corallum is simple, and free in all the known species. 



1. Genus Zaphrentis. 



Rafinesque and Clifford, Ann. des Sciences physiques de Bruxelles, vol. v, p. 234, 1820; Caninia, 

 Michelin, Diet, des Sc. Nat., Suppltm., vol. i, p. 485 ; Siphonophyllia, Scouler, in M'Coy's Carbonif. Foss. 

 of Ireland, p. 187, 1844. 



Corallum simple and trochoid. Calice deep. Septal fossula strongly developed, and 

 occupying the place of one of the septa. No columella. Tabula moderately developed, 

 and bearing on their upper surface a series of septa, which extend from the wall to the 

 centre of the visceral chamber, and are denticulate all along their calicular edge. 



Typ. sp., Zaphrentis patula ; Caninia patula, Michelin, Icon. Zooph., tab. lix, fig. 4. 



