CORALS OF THE LONDON CLAY. 
we 
Or 
3. ParacyaTuus BREVIS, Tab. IV, figs. 3, 3.4, 34, 3c. 
Paracyatuus BREVIS, Milne Edwards and J. Haime. Ann. des Scien. Nat., 3™ série, 
vol. ix, p. 323, 1848. 
The fossil remains of this species which we have had an opportunity of examining, are 
all more or less imperfect, and could not give us a complete knowledge of its character, 
but are sufficient to show that it belongs to the genus Paracyathus, and differs from all 
the other species of the same group. The general form of the corallum appears to be 
usually subturbinate and short (as im fig. 3) ; but if, as we have some reason to think, the 
natural interior cast represented in fig. 3¢ belongs to this species, the proportions of 
height and breadth must be very variable. ‘The coste are closely set, nearly equal, thick, 
and covered with dense granulations. The ca/ice is circular, and the fossula deep. The 
columella is concave, large, and delicately papillose. The septa are but very slightly exsert, 
closely set, thin towards the centre, and very thick towards the outer edge, strongly 
granulated laterally, and almost equally developed. The pal correspond to the septa of 
the first three cycla, and are very thin, lobulated, and, as usual, developed in an inverse 
ratio with the septa, in the prolongation of which they are placed. Height, from four to 
seven lines; diameter of the calice, six lines; depth of the fossula, one line and a half. 
The existence of only four cycla of septa distinguishes this species from Paracyathus 
Stokesii, P. Desnoyersii, and P. procumbens, in which there are five of these cycla; the 
tenuity of the pali distinguishes it from P. eguilamellosus, P. Pedemontanus, P. Turonensis, 
and P. crassus; it is nearest allied to P. caryophyllus, in which the pali are also very thin, 
and lobulated, but in the latter the septa are much thinner, and the general form is very 
different. 
Paracyathus brevis is found at the Isle of Sheppy, and the specimens figured in this 
Monograph belong to the cabinet of Mr. Bowerbank. 
Azperrant Group or tHE PSEUDOTURBINOLID Ai (p. xix). 
Genus DASMIA (p. XIX). 
Dasmia Sowersyi. Tab. IV, figs. 4, 4 a, 4 6. 
DrsmopuyLium, J. Decarle Sowerby. Trans of the Geol. Soc. of London, vol. v, p. 136, 
tab. viii, fig. 1, 1834. 
Dasmia Sowersyt, Milne Edwards and J. Haime. Ann. des Sc. Nat., 3™ serie, vol. ix, 
p- 329, tab. vii, figs. 8, 8a, 1848. 
Corallum subturbinate, straight, or slightly curved, and subpedicellate or adherent by 
a very narrow basis. Coste extremely broad, separated by deep, narrow furrows, obtuse 
4 
