56 
VINE : NEW OR BUT LITTLE KNOWN EOCENE POLYZOA. 
Zoarium was " cupuliforme " (T. 0., p. 937, pi. 608, fig. 6, d'Orb), 
or similar, in any other sense than that already described, to 
d'Orbigny's beautiful species. There is no evidence, judging from 
the preservation of the fragments in my possession, that this poly- 
zoon had ever been subjected to the wearing action of water for any 
length of time. The destruction of the peculiar habitat seems to have 
been sudden and complete, although in other places (vide remarks 
by Mr. Bell, ante) the destruction of the then living Brachiopods, 
though brought about similarly, may have been more marked than 
the destruction of the Polyzoan fauna. Such catastrophies are quite 
common in our British rocks, both Palaeozoic and Mesozoic. 
2. Lichenopora sp. (Mediterranea ? Blainv.) 
It is impossible, both on account of its peculiar habitat and poor 
preservation, to completely identify this species of Lichenopora. The 
zoarium is wholly adnate, irregular in outline, without marginal 
lamina, but hollowed in the centre. Its measurement is quite 
3 rams, in one direction and 2 k mm. in another. The zocecial rays 
are partly uni, and partly multiserial in their arrangement, but on the 
outer edges of the zoarium the orifices of the zooecia and the openings 
of the cancelli appear to be about equal in size, so that it is almost 
impossible to distinguish the one from the other. As this is the only 
true Lichenopora from British Eocene rocks that I have been able to 
examine, or in other words, the only species known to me, it would 
not do to pass it over, in spite of the difficulty of identifying it. On 
the fossil it is associated with a small colony of Membranipora 
holostoma, Busk (var. perforata n.v.), a few of the zooecia of which 
obliterates, to some extent, the face of the Lichenopora. 
Horizon and Habitat : Upper Eocene, Barton Clay ; On Voluta 
athleta. 
The only species known to me with which I can compare this 
Eocene form is the L. (Discoporella) mediterranea, Busk (Cat. Polyzoa, 
Brit. Mus III., p. 33, pi. 34, fig. 4), which the author identifies as 
follows : — 
1844. Lichenopora mediterranea, Blainville Man. d'Actinol, p. 407. 
1847. Actinopora mediterranea d'Orb., Prod, iii., p. 188. 
1852. Unicavea mediterranea, id. ib., p. 971. 
