536 BRITISH FOSSIL CORALS. 



circular, rather deep, with a small septal fossula. 8epta (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 

 ii'regular tahdcB. 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 is found in North America. 



9. Genus Acervularia, (p. Ixx). 

 1. Acervularia Goldeussi. Tab. LIII, figs. 3, 3«. 



CrATHOPHYLLUM ANANAS, Goldfuss, Petref., vol. i, p. CO, p]. xix, fig. 4ffl, 1826. (Not fig. Ah.\ 



— — Rail, 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, Ad. Roemer, Verst. des Harzgeb., p. 5, tab. ii, fig. 12, 1843. 

 AcEBVUlARiA GoLDFUSSi, Dfi Vemeuil and Jules Haime, Bull. Soc. Geol. de France, 2d ser., 



vol. vii, p. 161, 1850. 

 LiTHOSTROTiON ANANAS, (pars), D'Orbigny, Prod, de Paleont., vol. i, p. 106, 1850. 

 Acervularia Goldfussi, Milne Edwards and Jules Haime, Pol. Foss. des Terr. Palseoz., 



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. Septa (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 A. 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 A. pentagonal the corallites of which are also 

 much smaller. In A. Boemeri'^ these radii are very slender, and flexuous outwardly, and 

 the outer walls are very vaguely indicated. 



' Tab. liii, fig. 4. 2 Tab. liii, fig. 5. ^ Tab. liv, fig. 3. 



