240 
EADIOPOKIDJE. 
6. neocomiensis, d’Orbigny, 1853. 
Syx. Discocavea neocomiensis, d’Orbigny, 1853. Bry. Cret. p. 959, pi. 785, 
figs. 6-9. 
non ,, ,, Etheridge & Xewton, 1878. Cat. Cret. Foss. 
Mus. Pract. Geol. p. 7. 
Char. — Zoarium a large, thin, irregular disc, 8 mm. long by 6 mm. wide. Large 
central depression. The large apertures occur in radial lines, about thirty-four 
in number ; the longest lines contain six apertures. 
Distrib. — Xeocomian : Morteau, Doubs. 
Aff. — The type-specimen, according to M. Pergens (Rev. p. 384), is lost. The 
specimen from the Lower Greensand of Farringdon, Berkshire, in the Cunnington 
Collection in the Museum of Practical Geology, is a near ally of this species ; 
but it is a broken specimen, with diameters 10 and 6-5 mm. It differs 
from d’Orbigny’s figured specimen by having a smaller central depression, by 
having two radial centres, and has twelve instead of six apertures in each 
radial row. 
7. pocillum (d’Orbigny), 1851. 
Syh. Lichenopor a pocillum, 1851. Bry. Cret. pi. 645, figs. 1-4. 
,, {Biscocavea) pocillum, pars, Pergens, 1890. Rev. p. 382. 
,, ,, ,, Canu, 1900. Bry. Tours: C.R. Assoc. 
franq*. Av. Sci. 1899, p. 410. 
,, Ulrich, 1900. In Zittel-Eastman, Textbook Palaeont. 
vol. i. p. 265, fig. 430. 
Biscocavea ,, d’Orbigny, 1853. Bry. Cret. p. 959. 
Char. — Zoarium turbinate, attached by a short stalk, expanding rapidly upward, 
and with a convex upper surface. Lower surface covered by thick epizoarium. 
Central depression with about twenty apertures. Radial series long, irregular, 
and sinuous, with twelve to fourteen apertures in the longer rows. “■ 
Distrib. — Cenomanian : Le Mans. In the work quoted in the synonymy 
M. Canu records this species from the Coniacian of Tours. 
8. vassiacensis (d’Orbigny), 1850. 
Syx. Befrancia vassiacensis, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 120. 
,, ,, d’Orbigny, 1851. Bry. Cret. pi. 642, figs. 1-3. 
Unicavea ,, d’Orbigny, 1853. Ibid. p. 972. 
,, ,, Pergens, 1890. Rev. p. 384. 
Char. — Zoarium adnate, fiat, but with a convex, well-raised upper surface. A 
large central area of crowded, irregular apertures. The series of apertures are 
irregular in length ; the longest include about eight apertures ; the lines are 
separated by wide porous areas. 
Distrib. — Aptian: Grange-au-Ru, near Yassy, Haute - Marne ; les Croutes, 
Aube. 
