CORALS OF THE LONDON CLAY. 23 
Columella fasciculate, with very slender elements. Septa forming six complete cycla, 
closely set, very thin and broad; those of the first three cycla nearly equal. Pali rather 
large, and thin, scarcely thicker than the septa, and presenting laterally spmiform granu- 
lations ; those corresponding to the penultimate cyclum of septa being the most developed, 
the others nearly equal. 
This Coral soon acquires all its septa and its final diameter, but continues growing up, 
so that it becomes sometimes very tall, without expanding proportionally ; we have seen 
specimens three or four inches high, or even still longer. It has been found in the lower 
tertiary deposits of several localities in the south of France and the north of Italy. 
3. Genus PARACYATHUS (p. xiv). 
1. Paracyarnus crassus. Tab. IV, figs. 1, 1a, 14, le. 
Corallum subturbinate, short, fixed by a very broad basis, slightly contracted just 
above the lower end, and rather inflated at the upper part. Cosfe@ well marked from top 
to bottom, closely set, nearly equal in breadth, but alternately more or less prominent, 
especially near the calice, and covered with very delicate granulations. Cadice nearly 
circular when young, but becoming soon more or less oval; fossula deep. Colwmella 
concave, papillose, thick, and not distinctly separated from the inner lobes of the pali. 
Septa forming four complete cycla, and an incomplete rudimentary fifth cyclum, in one half 
of the systems corresponding to the long axis of the calice; closely set, straight, slightly 
exsert, thin towards the centre of the visceral chamber, rather thick externally, granulated 
laterally, and unequally developed according to relative age. Pa/i corresponding to the 
septa of the first three cycla, thick, tall, strongly granulated, and denticulated along the 
inner edge, which is rather oblique ; those corresponding to the tertiary septa larger than 
the others, and those that correspond to the primary septa being the smallest of all. 
Height, five or six lines ; long axis of the calice, four lines; short axis, three limes; depth 
of the fossula, three lines. 
This Paracyathus is easily distinguished from the other species of the same genus by 
the number of the septa, which in P. procumbens, P. Stokesii,? and P. Desnoyersii, form an 
additional cyclum ; by the size of the pali, which are much thicker than in P. caryophyllus, 
and P. brevis, and by the lobulate edge of these same organs, and the oval form of the 
calice, from P. equilamellosus, P. Pedemontanus,’ and P. Turonensis. 
Paracyathus crassus has as yet been found only in the London Clay of Bracklesham 
Bay, and has been communicated to us by Mr. Dixon and Mr. Frederick Edwards. 
1 Milne Edwards and J. Haime, Monogr. of Turbinolids, in Ann. Sc. Nat., 3dser., vol. ix, pl. x, fig. 6. 
2 Idem, loc. cit., pl. x, fig. 7. 3 See tab. iy, fig. 2. * See tab. iv, fig. 3. 
5 Caryophyllia pedemontana, Michelin, Icon., pl. ix, fig. 16. 
