EADIOPORA. 
287 
3. Radiopora labyrinthica (Michelin), 1846. 
Synonymy. 
Ceriopora labyrinthica, Michelia, 1846. Icon. Zooph. p. 208, pi. Hi. fig. 11. 
Radiopora bulbosa, d’Orbigny, 1851, 1854. Bry. Cret. p. 996, pi. 650, 
figs. 6-8. 
non ,, ,, ? Etheridge & Xewton, 1878. Cat. Cret. Foss. Mus. Pract. 
Geol. p. 7.^ 
Diagnosis. 
Zoarium. hemispherical, or with a flattened and pitted upper 
surface. Pits 1-3 mm. dia. The apertures of the zooecia 
occur on mieandriform bands across the zoarium, separating 
the pits which are occupied by the mesopores. The radial 
arrangement of the series of apertures is in places ill-defined. 
Distribution. 
Cenomanian : Le Mans, Sarthe ; Cherck, near Tournay, Belgium. 
Dimensions. 
The type- 
specimen. 
60,366. 
mm. 
mm. 
Height of zoarium 
11 ... 
10 
Diameter of zoarium 
22 ... 
17 X 19 
Diameter of zooecia 
•25--30 
Affinities. 
In the first volume of this Catalogue it was suggested that the 
Ceriopora labyrinthica of Michelin was a Cellulipora, and possibly 
the same species as Cellulipora ornata (Cat. Cret. Bry. Vol. 1. 
pp. 145, 146) ; and further (p. 147), Radiopora bulbosa of d’Orbigny 
was included as one of the unrepresented species of Cellulipora. 
The latter was the natural interpretation of d’Orbigny’s figure 
(pi. 650, fig. 7). A specimen of the R. bulbosa has now been found 
in the Tesson Collection, and its characters show that the structure 
is dimorphic and that the apertures of the mature zooecia are 
radial in plan. D’Orbigny was therefore quite correct in the 
generic position he assigned to his species, though the essential 
generic characters are not shown in his figure. 
The British Museum specimen has in places a pitted surface, 
and it links together Michelin’s C. labyrinthica and d’Orbigny’s 
1 The specimen on which this record is based (M.P.G., D. fx«?) is inde- 
terminable without sections. 
