BRITISH FOSSIL CORALS. 
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Genus Comosmris.! 
ComosERIs VERMICULARIS, Tab. XXIV, fig. 1. 
MEANDRINA VERMICULARIS, M‘Coy, Ann. of Nat. Hist., s. ii, v. ii, p. 402, 1848. 
Corallum composite, massive, convex; its upper surface overrun with strong, cristate, 
sharp ridges, which are very flexuous, somewhat ramified, and closely set. The septal 
laminee, which are very thin and crowded together, ascend parallel to the top of these 
ridges, where a delicate mural line is visible: about ten of these lamine are comprised 
in the space of one line, and they vary a little in size alternately. The depressions 
situated between these ridges are rather deep, but not very broad; so that when the struc- 
ture of the corallum is hidden by incrustations of extraneous matter, the general aspect 
of the fossil resembles very much that of Jeandrina. But im well-preserved specimens, 
it is easy to see that the above-mentioned depressions contain a series of distinct ca/ices, 
with confluent septa, but separate, well-defined fossule. Each calice has twelve septa 
which are closely set, slightly denticulated along their edge, and somewhat thickened 
towards the middle. In the corallites that are situated at the bottom of the depressions, 
most of the septa follow the general direction of these furrows ; but in those situated nearer 
to the top of the ridges, the septa become almost all perpendicular to the common mural 
lines ; some of them, however, are always more or less curved. Diameter of the calices, 
about one line; breadth of the depressions, two or three lines. 
We have seen only two specimens of this species ; one was found in the Great Oolite 
near Bath, by Mr. Lonsdale, and given by that Palontologist to the Geological Society’s 
collection; the other belongs to the Cambridge Museum, and was found in the Inferior 
Oolite at Leckhampton. 
C. vermicularis differs from the other two species of the same genus above described,’ 
by the form of its sharp edged ridges, and its thin, closely set septa. 
Family PORITIDA, (p. Wv.) 
Genus MicrosouENa, (p. lvi.) 
1. MicrosoLena rEGuLARIS. Tab. XXV, figs. 6, 6a, 60. 
ALVEOPORA MICROSOLENA, M‘Coy, Ann. of Nat. Hist., s. ii, v. i, p. 419, 1848. 
Corallum massive, subturbinate or lobulated, and more or less convex. The English 
1 See page 101. 
° C. irradians, tab, xix, fig. 1., and C. meandrinoides, D’Orbigny, loc. cit. 
