BOIULTICAYEA, STELLOCAVEA. 
261 
STELLOCAVEA, d’Orbigny, 1853. 
[Bry. Cret. p. 967.] 
Synonyms. 
Stellocavea, d’Orbigny, 1853; Hamm, 1881; Ubaghs, 1879, 1888; Pergens, 
1890 ; Ulrich, 1900 ; etc. 
Carinifer, Hamm, 1881. 
Diagnosis. 
Radioporidse with a simple, adnate, discoid zoarium, in which 
the upper surface has radial ridges supported by a lamina, 
formed by an upgrowth from the under surface of the 
zoarium. The apertures open along the radial ridges, and 
are usually biserial. 
Type Species. 
Stellocavea francqana^ d’Orbigny. Maastrichtian ; Maastricht. 
Affinities. 
This genus is allied to Lichenopora, and differs from it by the 
prominence of the lamina, which occurs along the middle of 
each radial ridge ; the existence of the lamina is indicated in 
the cariosa stage of Lichenopora stellata, but there it extends only 
a short distance into the zoarium from the margin of the disc. 
The Carinifer of Hamm ^ is described by its author as discoid, 
and attached by the whole underside of the zoarium ; as having- 
numerous radial ridges, which are biserial, with apertures along 
the outer edge of the radii, and with the two series separated by 
a raised keel; and as having the middle of the zoarium and the 
interradial spaces marked by irregularly arranged pores. Hamm 
elsewhere accepts Stellocavea as distinct, but the description of 
his new genus does not appear to bring out any adequate ground 
for its separation, and his type species C. trenhneri may be 
included as a synonym of S. francq^ana. 
Stellocavea francqana, d’Orbigny, 1853. 
Synonymy. 
Stellocavea francqana, d’Orbigny, 1853. Bry. Cret. p. 968, pi. 777, tigs. 6-10. 
„ ,, Hamm, 1881. Bry. mastr. Ob. -Sen. i., Cycl. p. 44. 
,, ,, Ubaghs, 1888. C.ll. Excursion: Bull. Soc. beige Geol. 
vol. i., Mem. pp. 221, 233. 
,, ,, Pergens, 1890. Rev. p. 384. 
Hamm. Bry. mastr. Ob.-Sen. i., Cycl. p. 2 
