58 BRITISH FOSSIL CORALS. 
This species is as yet the only known representative of our genus Peplosmilia,' and is 
easily distinguished from the other true Eusmiline, either by its lamellar columella or its 
complete epitheca; it may be considered as a Montlivaltia, having a lamellar columella. 
We have seen but one specimen of this fossil ; it was found in the Greensand at Haldon, 
and presented to the Geological Society by Mr. R. H. C. Austen. 
2. Genus TROCHOSMILIA (p. Xxiv). 
TRocHosMILIA (2) TUBEROSA. _ Tab. X, fig. 2, 2a. 
TurBINOLIA comprussA, (?) Morris, Cat. of Brit. Foss., p. 46, 1843. 
Corallum simple, compressed, even at its basis, cuneiform, subpedunculated, and pre- 
senting on each of its lateral edges, at a short distance above the basis, a broad but not 
very prominent tuberosity. Coste delicate, straight, not prominent, but very distinct from 
the basis upwards, closely set and somewhat unequal. Cadice elliptic and horizontal ; its 
small axis only half the length of the long axis. Fossula narrow, rather shallow, and 
elongated. No columella. Septa forming five complete cycla ; very thin, straight, closely 
set, and delicately granulated laterally ; those of the first and second cycla nearly equal in 
size and larger than the others, so as to produce the appearance of twelve systems; those 
of the fifth cyclum very small. Height, seven lines ; diameter of the calice, eight lines by 
four. 
The above-described specimen was found in the Greensand of Blackdown by our able 
friend Mr. J. S. Bowerbank. We have not, as yet, been able to ascertain the existence of 
dissepiments in the interseptal loculi, and consequently are not quite sure that it belongs 
to the genus Trochosmilia; if these parts do not exist it must be referred to the family of 
the Turbinolide, but we have not had the materials necessary for deciding that question. 
We shall therefore only add here, that this coral differs from the other species of Trocho- 
smilia described in our ‘ Monograph of the Astreide’ by the existence of the lateral tubero- 
sities, and the basis presenting scarcely any traces of adherence. 
It is probably this fossil which Mr. Morris referred to the Zurbinolia compressa of 
Lamarck, and mentioned as existing in the Greensand of Blackdown. 7. compressa belongs 
also to our genus 'I'rochosmilia, and is found in the Greensand at Uchaux in the South of 
France, but differs from 7. ¢vderosa by its general form. 
I The fossil described by M. Michelin under the name of Anthophyllum detritum (Icon. Zooph., tab. x, 
fig. 1) might at first sight be supposed to belong to this genus, for it presents some appearance of a lamellar 
columella; but that is owing to the presence of some extraneous matter adhering to the specimen figured by 
M. Michelin, and although the epitheca does no longer exist in this fossil, we have no doubt that it is in 
reality a Montlivaltia. 
