SEMIMULTICAVE A. 
241 
SEMIMULTICAVEA, d’Orbigny, 1853. 
[Bry. Cret. p. 979.] 
Synonyms. 
Ceriopora, pars, Michelin, 1841. 
non Radiopora, d’Orbigny, 1851. 
SemimuUicavea, Hamm, 1881 ; non Simonowitsch, 1871. 
JAchenopora, pars, Pergeiis, 1890. 
Heteroporella, Hennig, 1894. 
Diagnosis. 
Radioporiclae with a compound zoarium composed of a thick 
lamellar sheet made of confluent colonies, each having the 
structure of Biscocavea. 
Type Species. 
Ceriopora la7idrioti,WiQ\\Q\m,\^4i\. Albian: Belgium. Aptian: 
Switzerland. 
Semimult icavea variolata, n.sp. 
Diagnosis. , 
Zoarium an incrusting sheet, thinner than usual in the genus. 
Surface marked by circular shallow depressions, giving the 
zoarium a variolate aspect. The central groups of mesopores 
are irregularly defined. 
The zooecial groups are circular, and their boundaries are not 
sharply defined. 
Apertures in irregular radial series. Each line of apertures 
separated by a line of*mesopores. 
Dimensions. 
Eiguees. 
PI. Y. Eig. 5. The type-specimen, with Ceriopora collis (d’Orb.), 
di Terelratiila. Lower Greensand : Earringdon. D. 3027. 
Eig. ba. The zoarium ; nat. size. 
Eig. be. Part of the surface ; X 12 dia. 
Disteibdtion. 
Lower Greensand : Earringdon. 
mm. 
Area of zoarium 
Average diameter of depressions 
Diameter of apertures... 
Diameter of mesopores 
12 X 15 
1-5 
•12--15 
•05 
