nSCOCAVEA. 
233 
Bomopora, pars, d’Orbigny, 1854 ; Hamm, 1881 
Heteroporella, pars. Busk, 1859; Hincks, 1861; vou Beuss, 1872-3. 
Biscosparsa, Heller, 1867. 
Biscoporella, Busk, 1859, 1875. 
,, [Biscocavea), Pergens, 1890. 
Semimnlticavea, pars, Hamm, 1881. 
Diagnosis. 
Hadioporidse in which the zoarium consists of discoid groups; 
they are usually single, but a few groups may unite into 
a loose compound mass. 
Apertures, in radial, uniserial lines, separated by mesopores. 
Type Species. 
Discocavea irregularis, d’Orbigny, 1854 : Hry. Cret. p, 961 ; 
named on pi. 645, figs. 9-12, 1851, as Lichenopora irregularis. 
Senonian : France. 
This species is selected as type of the genus, none having 
been previously chosen from the eleven species included by 
d’Orbigny in the genus. Discocavea neocomiensis, the first in order 
of the speeies which d’Orbigny described, is unsuitable, as according 
to M. Pergens (Rev. p. 384) the type is lost. 
Affinities. 
This genus differs from Lichenopora, as the apertures are 
arranged in uniserial lines and not in elliptical groups. It 
therefore includes many recent Bryozoa, which are often named 
Lichenopora ; but, as is explained on p. 246, Lichenopora was 
founded on a conical Eocene species, which is very different from 
the recent Bryozoa often referred to the genus. 
The recent species should not retain the name Lichenopora. 
Busk recognized this fact, and named them Discoporella. But 
that name was only founded in 1859, and is therefore later 
than Discocavea. The only names founded on recent Bryozoa that 
appear to have any claim to adoption are Melohesia and Disporella. 
Melolesia appears a possible name, as it was applied by Audouin ^ 
in 1826 to the species radiata, of which a fine figure had been 
given by Savigny’^; and as Audouin then remarked that the 
Melohesia of Lamouroux was very badly figured and defined, it 
^ Explic. des Planches, Descript, de I’Egypte: Hist. Hat. vol. i. p. 235. 
2 J. C. Savigny. Descript, de I’Egypte: Hist. Nat. tom. ii. Planches, 
Polypes, pi. vi. fig. 3, Nos. 2-4. 
