246 
EADIOPORID^. 
LICHENOPORA, Defrance, 1823. 
[Diet. Sci. nat. vol. xxvi. p. 256.] 
Synonyms. 
Ceriopora, pars, Goldfuss, 1827 ; von Hagenow, 1846. 
Bomopor a, pars, d.'Orh\^uy, 1850; Ilamm, 1881; Vine, 1885. 
Befrancia, pars, von Hagenow, 1851; Schliiter, 1870; Marsson, 1887 ; Osswald, 
1890 ; Bucaille, 1890. 
von Eeuss, 1846 ; d’Orbigny, 1852, 1853; Fbaghs, 1879 ; 
Pergens, 1888, 1890 ; Hennig, 1894 ; pars, Ulrich, 1900. 
Tuhulipora, pars, Michelin, 1844. 
JRecticama, d’Orbigny, 1853. 
Tecticavea, d’Orbigny, 1854; non Macgillivray, 1895. 
d’Orbigny, 1853 ; Winkler, 1864; Ubaghs, 1879; pars, Ilainni, 1881. 
? Lopholepis, pars, Marsson, 1887. 
Heteroporella , von Reuss, 1872, 1873. 
Diagnosis. 
Radioporidae with the zoarium circular, and either adnate by the 
whole of the flat, broad base, or sub-conical and attached by 
a narrow base. There is a central depression on the upper 
surface ; and from the central depression radiates a series of 
grooves separating raised elliptical or sub-elliptical zooecial 
bundles. 
The zooecia having their apertures in the radial bundles are 
larger than those opening in the intervening grooves, which 
may be all mesopores. 
Type Species. 
Lichenopora turhinata, Defrance, 1823 : Diet. Sci. nat. vol. xxvi. 
p. 257. Middle Eocene (Calcaire grossier) : Hauteville and 
Orglandes, Manche. 
Affinities. 
This genus is used differently by many zoologists and 
palaeontologists, and it seems to me clear that in this case the 
palaeontologists are correct. The genus was founded by Defrance 
in 1823, and, according to his diagnosis, the zooecia open on the 
upper surface on either “ des cretes ou des rangees de tubes 
rayonnantes.” The diagnosis, therefore, does not distinguish 
between the forms with the apertures in unisexial rows and those 
in elliptical bundles. The genus, however, included only three 
