232 
RlDIOPORIDiE. 
Family EADIOPOKID^. 
Synonyms. 
Caveidce, pars, d’Orbigny, 1853. 
Ceriopor idee, pars, Busk, 1859; pars, Simonowitsch, 1871. 
Diastoporidee, pars, Busk, 1859. 
Lichenoporidee, Smitt, 1867, 1872, 1873, 1878 ; Hincks, 1884 ; Vine, 1885 ; 
Pergens & Meunier, 1886 ; pars, Ulrich, 1900. 
Biscoporellidce, Busk, 1875 ; pars, MacGillivray, 1887, 1895. 
Radioporidea, pars, Marsson, 1887. 
Diagnosis. 
Trepostomata with dimorphic zooecia. The normal zooecia are 
arranged in radial rows separated by series of mesopores. 
The zoarium is simple and discoid, or turbinate, or fungiform, 
or massive and multilamellar, or composed of blunt multi- 
lamellar stems. 
Affinities. 
This family is closely allied to the Heteroporidse, from which 
it differs by the radial arrangement of the zooecia. 
The genera form a long series, from the simple adnate discoid 
Biscocavea, to zoaria with branched cylindrical stems composed of 
many superposed discs as in Tholopora, and to the massive growths 
of Radiopora. The family begins in the Cretaceous, and during 
the same period attained its maximum ; it still survives, being 
represented by Tholopora, Lichenopora, and Biscocavea. 
DISCOCAVEA, d’Orbigny, 18u3. 
[Bry. Cret. p. 957.] 
Synonyms. 
Madrepora, pars, Linnseus, 1768 ; Fahricius, 1780. 
Melobesia, Audouin, 1826. 
Biscopora, pars, Fleming, 1828; de BlainviUe, 1830, 1834 ; Lamarck, 1816. 
TubuUpora, pars, Lamarck, 1816 ; Milne-Edwards, 1837'; Johnston, 1838 ; 
Gray, 1848 ; etc. 
Lichenopora, pars, Michelin, 1846 ; d’Orbigny, 1851 ; Hincks, 1880 ; pars, 
Waters, 1884, 1887; Vine, 1885; Pergens, 1890; Pocta, 1892 ; Harmer, 
1896 ; pars, Ulrich, 1900. 
Bisporella, Gray, 1848. 
Befrancia, pars, von Hagenow, 1851; d’Orbigny, 1851 ; pars, von Eeuss, 1872, 
1873. 
JJnicavea, pars, d’Orbigny, 1853. 
Raricavea, d’Orbigny, 1854. 
? Radiopora, pars, d’Orbigny, 1854; Simonowitsch, 1871. . 
