CORALS FROM THE DEVONIAN FORMATION. 239 
and are principally indicated by a small thickening of the septa. In general 26 septa, 
rather slender, granulated on the sides, and often slightly curved in the space comprised 
between the two mural investments; half of them do not extend further than the inner 
wall, and those which penetrate into the central area do not appear to have any paliform 
lobes. Diagonal of the corallites 3 lines; diameter of the inner walls 1 line. 
Found in Newton Quarry near Torquay. 
In the Collections of the Geological Society and Dr. Battersby. 
In this species the inner wall is rudimentary, as in 4. intercellulosa,' but the septa are 
less numerous, and do not give rise to paliform processes. 
6. AcervuLariaA Barrerssyt. Tab. LIV, fig. 2. 
AcERVULARIA Barrerssyl, Milne Ldwards and Jules Haime, Pol. Foss. des Terr. Palzeoz., 
p. 419, 1851. 
A horizontal section of this species shows that the Corallites are very closely united 
together and limited only by a very thin exterior wall, which form zigzags, is slightly 
marked, and constitutes polygonal divisions. The czver wails are, on the contrary, very 
thick, and circumscribe a central area, which is very small in proportion to the space 
occupied by the whole of each Corallite; they appear to be composed of a dense exothecal 
tissue. Septa (36), of equal size in the outer area, very slender, for the most part much 
curved, almost confluent, and slightly thickened, where enclosed in the inner wall; half of 
them extend almost to the centre of the visceral chamber, where they present a small 
paliform lobe. Dissepiments very abundant and closely set in the exterior area, but almost 
completely absent in the inner area. Great diagonal of the Corallites 6 or 8 lines; 
diameter of the calices 2 lines, or somewhat more. 
Found at Torquay and at Newton. 
In the Collections of the Geological Society and Dr. Battersby. 
This species, by the feeble development of the outer walls and its subconfluent septa, 
leads to the genus Phillipsastrea. It differs from 4. Roemeri, where the exterior wall is 
also but slightly developed, by the septa being more numerous and provided with a 
paliform lobe. 
7. AcERvuLARIA Roxmeri. Tab. LIV, fig. 3. 
AsTrEA Hennauu, dd. Roemer, Verst. des Harzgebirges, p. 5, tab. ui, fig. 18, 1843. (Not 
Lonsdale.) 
— PARALLELA ? Ibid., tab. iii, fig. 1. 
PHILLIPSASTREA PARALLELA ? D’ Orbigny, Prod. de Paléont., vol. i, p. 107, 1850. 
| Tab. lili, fig. 2. 
