236 BRITISH FOSSIL CORALS. 
circular, rather deep, with a small septal fossula. Sepfa (80 or even more) very thin, 
closely set, rather broad at their upper end, where they are arched and denticulate, 
alternately larger and smaller, slightly twisted near the centre of the visceral chamber. 
A vertical section shows that the lateral processes of the septa are arched and ascendant ; 
those situated towards the upper end of the corallum terminate at the edge of the septa ; 
those situated lower down unite near the centre of the visceral chamber, so as to constitute 
regular ¢abule. The interseptal loculi are filled up with these lamellate processes, which 
are situated at about half a line apart, and united by closely-set simple dissepiments that 
form right angles with them. Diameter of the calice from 1 to 2 inches. 
The specimen submitted to our investigation was found at Torquay. Prof. Phillips 
has also met with this fossil at Plymouth, Babbacombe, and Sharkham Point. The same 
species 1s found in North America. 
9. Genus AcuRVULARIA, (p. Ixx). 
1. Acervunaria Gotprussi. Tab. LITT, figs. 3, 3a. 
CYATHOPHYLLUM ANANAS, Goldfuss, Petref., vol. 1, p. 60, pl. xix, fig. 4a, 1826. (Not fig. 46.) 
— — Hall, Handb. der Petref., p. 416, 1830. 
— = Morren, Descr. Corall. in Belgio Repert., p. 56, 1832. 
= — Milne Edwards, 2d edit. of Lamarck, vol. ii, p. 429, 1836. 
ASTREA BASALTIFORMIS, dd. Roemer, Verst. des Harzgeb., p. 5, tab. ii, fig. 12, 1843. 
ACERVULARIA GoupFusst, De Verneuil and Jules Haime, Bull. Soc. Géol. de France, 2d ser., 
vol. vii, p. 161, 1850. 
LITHOSTROTION ANANAS, (pars), D’ Orbigny, Prod. de Paléont., vol. i, p. 106, 1850. 
ACERVULARIA Gouprussi, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palzeoz., 
p- 417, 1851. 
Corallum composite, massive, astreiform; the polygonal lines on its surface well 
marked and rather zigzagged. Great diagonal of the corallites about 3 lines. The inner 
wall well constituted, rather strong, with the septa somewhat exsert, and being only 
about 1 line in diameter. Sepfa (24 or 26) almost straight, very slender, and extending 
alternately more or less towards the centre. Dissepiments rather closely set. 
Found at Torquay, by Dr. Battersby. 
This species much resembles 4. coronata' by the development of its inner and outer 
walls, but differs from it by the septa being somewhat unequal in size. The costo-septal 
radii are still more similar and closer set in 4. pentagona,” the corallites of which are also 
much smaller. In 4. Roemeri® these radii are very slender, and flexuous outwardly, and 
the outer walls are very vaguely indicated. 
' Tab. lili, fig. 4. 2 Tab. li, fig. 5. 3 Tabi liv, fig. 3: 
