140 BULLETIN OF THE 



Tabulse, however, there are none, the interseptal chambers being open from 

 top to bottom. Among the Rugosa this character is only found in the 

 family of Cyathaxonidae, to or near which, therefore, our coral must find 

 its place. From the genus Cyathaxonia it differs in being attached by a 

 broad base, and also by the absence of a septal fossula. The following 

 genus is proposed for its reception : — 



Genus Haplopnyllia Fourt. 



Corallum simple, fixed by a broad base, covered with a thick epitheca; 

 columella st.yliform, strong, (sometimes double?) very thick at the base. 

 Interseptal chambers deep, uninterrupted by tabulae or dissepiments. 



Haplophyllia paradoxa Pourt. 



Corallum subcylindrical, short, fixed by a broad base; epitheca thick, 

 wrinkled, reaching higher than the calicle, and forming around the latter 

 sevei'a! concentric circles, as it' represen! ing the separated borders of several 

 superposed layers. Calicle circular, fossa deep. Septa smooth, without 

 granulations or perforations, not reaching the border of the calicle; like all 

 the internal parts of the calicle, their surface is like enamel. Columella 

 formed of two smooth conical processes, very thick at the base and tending 

 to fill up the chambers. Eight septa larger, and connected with the colu- 

 mella, alternating with smaller ones, which touch the columella at a much 

 lower level. A further cycle is indicated by small ridges of the wall sur- 

 face, in some of the chambers. No distinction can lie mule between pri- 

 mary and secondary septa among the eight larger ones, as they all appear 

 equal. This arrangement seems to be the norm. In the specimen before 

 us, the only one unfortunately, there are disturbances in two of the sys- 

 tems or half-systems (systems if we call the eight larger septa primaries, 

 half-systems if we suppose them equivalent to primaries and secondaries). 

 In one case two of the larger septa are joined by a horizontal plate at 

 the top, thus excluding the intervening chamber from the calicle. This 

 structure is probably abnormal, and the result of an efForf to exclude a par- 

 asite or other foreign matter. A small supernumerary septum has grown 

 out in the next chamber. Nearly on the opposite side of the calicle, one of 

 the secondary septa (counting eight as primaries) has crown to the size 

 of a primary one, and the adjacent tertiary to the size of a secondary, thus 

 distui bin- the symmetry. 



Height about .', an inch; diameter of calicle the same. 



Tiiis coral was living when obtained; the polyp was of a greenish 

 color, but was not otherwise examined when fresh. After having been in 

 alcohol, it could be lilted out entire from the calicle. presenting an exact 



