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 A. inter ceUulosa,^ but the septa are 

 less numerous, and do not give rise to pahform processes. 



6. AcEEVULARiA Battersbyi. Tab. LIV, fig. 2. 



AcERVULAEiA Battersbti, Mihie Edwards and Jules Eaime, Pol. Foss. des Terr. Palseoz., 



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 imier walls 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 w^all ; 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 A. Boemeri, where the exterior wall is 

 also but shghtly developed, by the septa being more numerous and provided with a 

 paliform lobe. 



7. ACERVULARIA RoEMERI. Tab. LIV, fig. 3, 



AsTBEA Hennahii, Ad. Roemer, Verst. des Harzgebirges, p. 5, tab. ii, fig. 13, 1843. (Not 

 Lonsdale.) 

 — PARALLELA ? IMd., tab. iii, fig. 1 . 

 Phillipsastrea parallela ? D'Orbigny, Prod, de Pal^ont., vol. i, p. 107, 1850. 



' Tab. liii, fig. 2. 



