286 Annals of the South African Museum. 



Membranipora perforata (Reuss). 



1846. Eschar ina 'perforata, Reuss, Verstein. d. Bohm. Kreidef ormat. , 

 p. 68, pi. XV., fig. 23. 



Encrusting specimen 3 in several places is a little Meynhrcmipora 

 (specimens 3&, 3c, and M) in which the zooecia form single lines. 

 Often one zooecium is attached to the next by a long stalk, though in 

 other places the stalks are short and the zooecia crovyded like those 

 in Reuss' figure. M. perforata is found in the Cenomanian Planer- 

 kalk of Bohemia. 



Genus ESCHARA,Busk. 



Eschara Royana, d'Orbigny, 



1851. Eschara Boyana, d'Orbigny, Pal. Fran9. Terr. Cr6t., vol. v., 

 p. 108, pi. 602, figs. 12, 13, and pi. 673, figs. 2, 3. 



A few zooecia (specimen bb) encrusting Elea meridiana differ from 

 d'Orbigny 's figure of Eschara Boyana in having more space between 

 the zooecial rims. In d'Orbigny's figure two neighbouring zooecia 

 have a common rim, and no line marks a crack or furrow between 

 them. In specimen bh the rims, if adjacent, always have a crack or 

 furrow and in some cases a small space dividing them. This species 

 occurs in the Senonian of Charente-Inferieure. 



Eschara Delarueana, d'Orbigny. 



1851. Eschara Delarueana, d'Orbigny, Pal. Pran9. Terr. Cret., 

 vol. v., p. 105, pi. 602, figs. 6-8, and pi. 673, fig. 8. 



Specimen 7 is probably a more perfect example of this species than 

 was d'Orbigny's specimen. The base of the aperture in d'Orbigny's 

 figure shows a tendency to project in the middle. In many zooecia 

 of specimen 1 this projection is seen to take the form of a flattened 

 "dove-tail." Besides the large vicarious avicularia shown in 

 d'Orbigny's figure there is in specimen 1, sessile on the corner at 

 the proximal end of one zooecium a very small sharply-curved horn- 

 shaped avicularium. This specimen also shows ovicells and closed 

 zooecia with minute perforations. E. Delarueana is found in the 

 Senonian of Charente-Inferieure. 



