STELLOCAVEA, ACTINOTAXIA. 
263 
D. 3771. A broken zoarium (in tube), determined by M. Pergens as Lopholepis 
irregularis (Hag.). Maastricbter Kalk. Petit- Lanaye, Limburg. 
Gamble Coll. 
TJXREPRESEOTED SPECIES, 
cultrata, d’Orbigny, 1853. 
Syn. StelUcaveacuUrata^^^r\i\^xs.\\ 1853. Bry. Cret.p. 969, pi. 777, figs. 11-13. 
,, ,, Pergens, 1890. Rev. p. 384. 
,, ,, Hamm, 1881. Bry. mastr. Ob. -Sen. i., Cyel. p. 44. 
Char. — Zoarium with an. irregular, serrated margin. About six long primary 
ridges and six shorter secondary ridges. 
Distrib. — Senonian— Maastrichtian : Maastricht. 
Aff. — Possibly only an irregular variety of the S. francqana. 
ACTINOTAXIA, Hamm, 1881. 
[Bry. mastr. Ob. -Sen. i., Cycl. p. 44.] 
Diagnosis. 
Radioporidae with a unilamellar or multilamellar zoarium, 
composed of round sub-colonies, which, though independent, 
have become fused. The central zooecia of the sub-colonies 
are in radial biserial rows. The lamina between the two 
series in each row is thick, and projects above as a keel. 
Smaller zooecia scattered irregularly between the radial rows. 
Type Species. 
Actinotaxia magna, Senonian — Maastrichtian: Maastricht. 
Affinities. 
This genus, which is of doubtful value, may be regarded as 
a compound Stellocavea. It has the carinate radii of that genus, 
but the zoarium is compound. 
UNREPRESENTED SPECIES, 
magna, Hamm, 1881. 
. Actinotaxia magna, Hamm, 1881. Bry. mastr. Ob. -Sen. i., Cycl. p. 44. 
Char. — Zoarium widely spread out. The sub-colonies are flat and plate-like, 
with a round depression in the middle of the upper side ; the underside is flat, 
with a slightly projecting peduncle in the middle. Zooecia wide and thick- 
walled. Apertures of the radial series large, elongated transversely, irregularly 
rectangular, crowded, flush. Between the radial rows are irregular, angular, 
smaller apertures. 
Distrib. — Senonian — Maastrichtian : ^Maastricht. 
