DISCOCAVEA. 
23.5 
non Heteroporella colUs, von Eeuss, 1872-3. Bry. nnt. Quad.: Palacontogr, 
vol. XX. pt. i. p. 133, pi. xxxiii. fig. 6. 
Befrancla reticulata, von Hagenow, 1851. Bry. maastr. Kr. p. 43, pi. iv. fig. 3 
{non fig. 4 as erroneously in text and description 
of plate). 
,, ,, Kade, 1852. Los. Verst. Schanzenb. p. 31. 
Dlscocavea ,, Marsson, 1887. Bry. Kiig. : Pal. Abb. vol. iv. p. 40. 
non Radiocavea reticulata, d’Orbigny, 1853. Bry. Cret. p. 965 (on Goldf. 
figs. Via, b, c, 
fig. 4). 
not d, e, f, and on Hag. pi. iv. 
J J 5 J 
,, Winkler, 1864. 
Musee Teyl., Cat. Pal. livr. ii. 
p. 11. 
,, TJomopora 
,, Hamm, 1881. 
Bry. mastr. Ob. -Sen. i., Cycl. 
CO 
? ,, cochloidea {non Hag.), d’Orbigny, 1854. Bry. Cret. p. 990, 
pi. 781 , figs. 5-7. 
Raricavea perforata, d’Orbigny, 1854. Ibid. p. 986, pi. 780, figs. 11-14. 
JAchenopora perforata, Pergens, 1890. Rev. p. 383. 
Diagnosis. 
Zoarium elliptical or circular; thick, with a rounded, convex upper 
surface, in the centre of which is a well-marked depression. 
Apertures in well-raised rows, which are short and contain 
from four to eight apertures in each row. Mesopores 
uniserial to triserial at the outer margin. 
Dimensions. 
D’Orbigny’s 
type. 
B.M. 50,468. 
B.M. D. 2757. 
mm. 
mm. 
mm. 
Diameter of zoanuni 
3 y 2-5 
4-5 X 3*7 
Cn 
X 
o 
Thickness of zoarium 
•8 ' 
1 
1 
Diameter of apertures 
— 
•07 
•07--08 
Distkibution. 
British : 
Upper Cbalk : Bromley, Kent ; on Echinocorys scutatus, Broadstairs. 
Zone of Belemnitella mucronata : Clarendon, near Salisbury. 
Middle Cbalk — Zone of Micraster corlestudinarium : Cbatbam. 
Foreign : 
Senonian — Maastricbtian : Maastricht; Ste. Colombo, Mancbe ; PPerignac, 
Cbarente-Inferieure. 
Campanian : Meudon, near Paris. 
Santonian : Saintes. 
Coniacian : Les Rocbes, Lisle, Villedieu, and Vendome, Loir-et- 
Cber ; Joue and Tours, Indre-et-Loire. 
Zone uncertain : Merpins, Cbarente. 
