290 
EADIOPORIDiE. 
Affinities. 
This species is allied to R. huotiana, of which it may be a young 
form, in which the radial arrangement of the large apertures 
has not been fully developed. The radial grouping is not shown 
in Simonowitsch’s figures, and I therefore felt doubtful from 
them whether his species was a Radiopora ; but the arrangement 
is developed in one of the Museum specimens (D. 3613). 
LIST or SPECIMENS. 
D. 3627. Three small specimens (in tube). The largest is 9 x 8 mm. in 
diameter and 9 mm. high ; the form is clavate, with a broad base 
and constriction above it. The second specimen is 5 x 4 mm. 
in diameter and 8 mm. high ; it is regularly obconic, with smooth 
sides. The third specimen is also obconic, but the sides are 
annular. Essener Griinsand. Essen. Old Coll. 
D. 3613. A zoarium, 6 mm. high and 4 mm. in diameter. The form is 
clavate, with a flat base and slight peduncle. Mesopores scanty, 
and the radial lines of apertures are only faintly indicated. 
Essener Griinsand. Essen. Purchased R. F. Damon, 1877. 
6. Radiopora bosquetiana (vou Hagenow), 1851. 
Synonymy. 
Stellipora bosquetiana, von Hagenow, 1851. Bry. maastr. Kr. p. 45, pi. v. 
fig. 8. 
,, ,, Winkler, 1864. Musee Teyl., Cat. Pal. livr. ii. p. 211. 
Bomopora ,, d’Orbigny, 1854. Bry. Cret. p. 988. 
,, ,, Ubaghs, 1879. Descr. G4ol. Pal. Limb. p. 224. 
,, ,, Hamm, 1881. Bry. mastr. Ob. -Sen. i., Cycl. p. 43. 
Diagnosis. 
Zoarium beginning as a cylindrical, erect stem, with apertures 
in vertical series ; the zoarium expands upward into a group 
of several knob-shaped zooecial groups. In these groups 
the radial rows of apertures are very numerous, and each row 
contains about twelve apertures. The centre of each group 
is convex and not depressed. The groups are separated by 
broad valleys, occupied by irregularly crowded mesopores. 
Distribution. 
Senonian — Maastrichter Kalk : Maastricht. 
