10 Annals of the South African Museum. 



and the apertures less regularly arranged. The peristomes, too, are 

 higher; but in the three specimens of this species among the material 

 here described the peristomes are worn. 

 Distribution. Cenomanian to Danian. 



ENTALOPHORA MADREPOBACEA (Goldfuss). 

 Plate I., fig. 14. 



1827. Ceriopora madreporacea, Goldfuss, Petref. Germ., p. 35, pi. x., 



figs. 12a and b. 

 1851. Pustulipora madreporacea, von. Hagenow, Bry. Maastr. kr., 



p. 18, pi. i., fig. 8. 



Zoarium consisting of cylindrical branches ; the apertures are 

 distant from one another in a proximal-distal direction less than four 

 diameters of an aperture ; there are four to six apertures in the 

 breadth of a branch ; the apertures are somewhat irregularly arranged 

 in spirals ; the zocecia are immersed. Three ill-preserved specimens 

 from among the East London material are doubtfully referred to this 

 species. All are very short fragments of stout branches, and, in so 

 far as the zooecial characters can be determined, resemble E. madre- 

 poracca more closely than any other form. 



Distribution. Cenomanian to Danian. 



GENUS SPIROPORA, Lamouroux. 



Spiropora should probably be united with Entalophora, for in 

 many species of the latter genus the apertures are arranged 

 spirally. Spiropora, however, may be defined as resembling 

 Entaloplwra, but the apertures are arranged in whorls, or, if in 

 spirals, these are very much looser than in Entalopliora. 



SPIROPORA VERTICILLATA (Goldfuss). 

 Plate I., fig. 13. 



1827. Ceriopora verticillata, Goldfuss, Petref. Germ., vol. i., p. 36, 



pi. xi., fig. 1. 

 1851. Cricopora verticillata, von Hagenow, Bry. Maastr. kr., p. 20, 



pi. i., fig. 12. 



Zoarium consisting of cylindrical branches, having the apertures 

 arranged in whorls ; there are five to ten apertures in the breadth of 

 a branch ; the whorls are distant four or five diameters of an aperture ; 

 the distance between the apertures of a whorl is a half or less than a 

 half the diameter of an aperture ; the zooecia are immersed, but the 



