IDMOXIID^. 
297 
Yol. I. p. 216, add : 
CLAVICLAVA, d’Orbigny, 1854. 
[Bry. Cret. p. 1028.] 
Diagnosis. 
Idraoniidae with spatulate erect zoarium, with the apertures 
confined to one face of the expanded end of the zoarium. 
The apertures are flush with the surface of the zoarium, and 
are arranged in ill-defined transverse lines. 
Type Species. 
(7. d’Orhigny, 1854. !Yeocomian : France. 
Affinities. 
This genus was included by d’Orbigny among the Cavidae as 
a close ally of Ceriopora. It was placed by M. Pergens in his 
Cerioporidae, with the same affinities. But the information given 
by d’Orbigny does not indicate any particular resemblance to the 
Ceriopora group, for the zoarium is a flat layer and not massive ; 
and it has apparently simple zooecia with no indication of either 
cancelli or mesopores. The limitation of apertures to the obverse 
face of the zoarium, and the suggestion given by d’Orbigny’s 
figure of their occurrence in transverse rows, both support the 
affinity of this genus to the Idmoniidie, of which it is a primitive 
but somewhat aberrant form. 
compressa, d’Orbigny, 1854. 
Claviclava compressa, d’Orbiguy, 1854. Bry. Cret. p. 1028, pi. 790, figs. 10-13. 
,, ,, Pergens, 1890. Eev. p. 387. 
Distrib. — Xeocomian: Foutenoy, Yonne. 
CEIDMONEA, Pergens, 1893. 
The genus Ceidmonea, Pergens, of which the type species is 
C. macgiUivrayi, Pergens, is founded on a worn branch, of which 
the only certain character is that the zooecia opened on one face 
only. The type-specimen, judging by M. Pergens’ excellent figure, 
is so imperfect and worn that both genus and species appear to 
me useless. 
Pergens, Nouv. Bry. Cret. Limb. : Bull. Soc. beige Geol. vol. vii. 1893, Mem. 
p. 179, pi. ix. fig. 3 {non 4 as in text). 
