CORALS OF THE UPPER CHALK. AT 
Family ASTREID Ai (p. xxi). 
Tribe EUSMILIN A (p. xxin). 
1. Genus PARAsMILIA (p. xxiv). 
1. Parasmiyia centrauis. ‘Tab. VIII, figs. 1, la, 14, le. 
Manpreporits, Parkinson, Organ. Remains of a FormerWorld, yol. ii, tab. iv, figs. 15, 16, 1820. 
Maprepora CENTRALIS, Mantell, Geol. of Sussex, p. 159, tab. xvi, figs. 2, 19, 1822. (Cor- 
rect figures.) 
CARYOPHYLLIA CENTRALIS, Fleming, British Animals, p. 509, 1828. 
— — Mantell, Trans. of the Geol. Soc., 2d series, vol. ii, p. 204, 1829. 
—_ —_ Phillips, Must. of the Geol. of Yorkshire, part i, p. 119, tab. 1, 
fig. 13, 1829; 2d edit., p. 91. 
— — S. Woodward, Synoptic Table of Brit. Org. Remains, p. 6, 1830. 
Caryopuytira, R. C. Taylor, in Mag. of Nat. Hist., vol. ii, p. 271, fig. 4, 1830. 
LITHODENDRON CENTRALE, Ch. Keferstein, Die Naturgeschichte des Erdkorpers, vol. u, 
p. 789, 1824. 
TURBINOLIA EXCAVATA (?), Hagenow, in Leonard’s und Bronn’s Jahrbuch fiir Mineral., p. 229, 
1839. 
— CENTRALIS, Fred. Adolph Remer, Verstein. des Norddeutschen Kreidegebirges, 
p- 26, 1840. 
— — Bronn, Index Paleontologicus, p. 314, 1848. 
PARASMILIA CENTRALIS, Milne Edwards and J. Haime, Monogr. des Astreides, Ann. des 
Se. Nat., 3™° serie, Zool. vol. x, p. 244. 1848. 
MoNocCARYA CENTRALIS (?z parte), Lonsdale, in Dixon’s unpublished work on the Chalk 
Formations of Sussex, tab. xvii, figs. 1,3, 7, 7 a, 9 
(ceeteris exclusis). 
Corallum simple, cylindrico-turbinate, fixed by a rather broad basis, above which it is 
much contracted, elongate, irregularly bent in various directions, and presenting a series of 
unequal contractions and circular dilatations. Coste closely set, and distinct from the 
calicular margin down to the basis, where they are the most prominent ; those corre- 
sponding to the primary and secondary septa are rather larger than the others towards 
the basis; but the tertiary ones soon become almost similar to the former, and at the 
upper part of the wall all these large coste alternate with smaller ones belonging to 
the fourth cyclum. All are covered with delicate granulations, which are most prominent 
towards the lower part of the coste of the fourth cyclum, where they form simple series. 
Calice circular, with the fossula less shallow than usual in this genus. Colwmedlla well 
developed, somewhat prominent and crispate. Sepa forming six equally developed systems 
and four complete cycla ; closely set, very unequal, broad, thin, slightly exsert, straight, or 
