396 
SPAESICAVEA. 
Affinities. 
The general aspect of this species is much like that of the 
earlier figures of Myriapora {Myriozoum) ; but that genus is 
a Schizoporellicl, and thus is far removed fi’om the Cretaceous 
species which d’Orhigny refeiTed to it. This species is very 
distinct from the other Sparsicavece^ and may perhaps deserve 
generic distinction ; for in many parts of the zoarium the maculae 
occur only as widenings of the interzooecial sutures. But in other 
parts, as in that shown in Fig. 53, the maculae occur as a single 
ring in the wall of each zooecium, and thus the species may be 
regarded as a Sparsicavea with large apertures and few maculae. 
The specimen figured by d’Orbigny as Entalophora clava (viz. 
pi. 620, fig. 6) seems to be clearly a specimen of this species : 
it has the large apertures surrounded by a ring of maculae. The 
zooecia subsequently figured by d’Orbigny when he included the 
species in Clavielausa (pi. 765, fig. 5) have small apertures and 
are surrounded by a wide intermediate zone ; they belong to one of 
the more typical SpavsicavecB, probably to a fragment of S. heteropora 
with the apertures less crowded than in the typical form. 
Pergens included specimens figured by d’Orbigny (\*iz. pi. 620, 
fig. 6) as Heteropora clava in Cavea elongata\ but M. Canu^ has 
pointed out the difference between them. 
LIST OF SPECIMENS. 
British. 
23,220. A large zoarium. Upper Greensand. "Warminster. J. Baker Coll. 
Foreign. 
-D. 4390. Two zoaria. Cenomanian. Cap de la Heve, Seine- Inf erieure. 
Presented by W. Hill, Esq. Figd. No. 53, p. 395. 
D. 7065. A thick branched fragment (on slide) . Korycaner Schichten. Kank, 
* Bohemia. Fric Coll. 
UNBEPHESENTED AND DOUBTFUL SPECIES. 
1. concinna (Bomer), 1840. 
Syn. Heteropora concinna^ Eomer, 1840. Verst, nordd. Kr. p. 4, pi. v. fig. 27. 
,, ,, Schliiter, 1870. Eeise S. Schwed. : N. Jahrh. 1870, 
p. 940. 
Millepora madreporacea, Giebel, 1848. Planerm. Quedl. : Zeit. Zool. Zoot. 
vol. i. p. 10. 
^ Canu. Bry. St. Cal. ; Bull. Soc. geol. France, ser. 3, vol. xxv. p. 747. 
