238 
RADIOPOKIDiE. 
Disteibutiok. 
Lower Chalk: Southeram Pit, near Lewes. 
!Figdees. 
PL I. Fig. 10^. The type -specimen ; x 3 dia. Fig. lOi, part 
of the same; X 10 dia. Lower Chalk; Southeram Pit, near Lewes. 
Capron Coll. D. 4587. 
Affinities. 
This species differs from B. irregularis (d’Orb.) owing to the 
greater length and regularity of its radii. 
J). 4587. A zoarium attached to a crushed Nautilus. Lower Chalk. Southeram 
Pit, east of Lewes. Capron Coll. Figd. PI. I. Figs. 10a, b. 
UNREPRESENTED SPECIES. 
1. cenomana (Michelin), 1846. 
Syn. Lichenopora cenomana, Michelin, 1846. Icon. Zooph. p. 204, pi. lii. fig. 14. 
,, [Discocavea) cenomana, Pergens, 1890. Rev. p. 382. 
Defrancia cenomana, d’Orbigny, 1850. Prod. Pal. vol. ii. p. 175. 
,, ,, d’Orbigny, 1851. Bry. Cret. pi. 642, figs. 9-11. 
Discocavea ,, d’Orbigny, 1853. Ibid. p. 960. 
Defrancia radiata, d’Orhigny, 1851. Ibid. pi. 642, figs. 4-6. 
Unicavea subradiat a, ^'Ovhi^xrs', 1853. p. 972. 
Char. — Zoarium adnate, with a convex upper sinface ; irregularly elliptical or 
lobed in outline. The typical cenomana has a small central area, a lobed 
margin, and radial solid ridges ; the form subradiata has a larger central area 
and regular lines of apertures, which are thickest at their inner ends. 
Distrib. — Cenomanian : Le Mans, Sarthe ; He Madame, Charente-Inferieure. 
Aff. — M. Pergens is the authority for the union of these two apparently distinct 
forms in the same species. 
2. compressa (d’Orbigny), 1851. 
Syn. Lichenopora compressa, d’Orbigny, 1851. Bry. Cret. pi. 645, figs. 5-8. 
non ,, ,, Vine, 1889. Further on Cambr. Greensd. : Proc. 
Yorks. Geol. Soc. new ser. vol. xi. p. 270, 
pi. xii. figs. 11, 12. 
Discocavea ,, d’Orbigny, 1853. Bry. Cret. p. 961. 
Domopora ,, Hamm, 1881. Bry. mastr. Ob. -Sen. i., Cycl. p. 43. 
Lichenopora pocillum, pars, Pergens, 1890. Rev. p. 382. 
Char. — Zoarium turbinate, laterally compressed. Upper surface only slightly 
convex, with a long elliptical central area of crowded zooecia. Linear series of 
apertures short and regular, about thirty-two in number, alternately long and 
short ; the longer series have about seven or eight apertures. 
