238 BRITISH FOSSIL CORALS. 



Found at Torquay. 



In the Collections of Dr. Battersby and Mr. Pengelly. 



This species resembles A. limitata} in having the inner wall rudimentary, and indicated 

 only by a thickening of the septa ; it differs from it, as well as from the other Acervularia, 

 by the great number of the septa. 



4. Acervularia pentagona. Tab. LIII, figs. 5, 5a, 5/5. 



Cyathophyllum pentagonum, Goldfuss, Petref. Germ., vol. i, p. 60, tab. xix, fig. 3, 1826. 

 Favastrea pentagona, De Blainville, Diet. Sc. Nat., vol. Ix, p. 340, 1830. — Man., p. 375. 

 Cyathophyllum pentagonum, Morren, Desc. Corall. Belg., p. 56, 1832. 



— — Milne Edwards, 2d ed. of Lamarck, vol. ii, p. 430, 1836. 

 AsTREA pentagona, Lonsdale, Geol. Trans., 2d ser., vol. v, pi. 57, fig. I, 1840. (Not fig. la.) 



— — Phillips, Palseoz. Foss., p. 11, pi. vi, fig. 15, 1841. 



Acervularia pentagona, Michelin, Icon., p. 180, pi. xlix, fig. 1, 1845. 



— ananas. Ibid., p. 180, pi. xlvii, fig. 1. 



LiTHOSTROTlON PENTAGONUM, D'Orbigny, Prod., vol. i, p. 106, 1850. 



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



p. 418, 1851. 



— — M'Co7j, Brit. Paleeoz. Foss., p. 91, 1851. 



Corallum forming an astreiform mass. CoraUites somewhat unequal in size, polygonal, 

 their great diagonal measuring in general about 2 lines, and the diameter of the inner 

 walls about half a line. Septa (18 to 24) subequal, slender, and almost straight. The 

 lines of demarcation between the corallites slightly zigzagged. 



Found at Torquay and at Ogwell. Prof. Phillips mentions having met with this 

 species at Newton Bushel, Sharkham Point, and Babbacombe. It is found also in the 

 Eifel, and in the province of Limbourg. 



In the Collections of Messrs. Bowerbank and Pengelly. 



This is the smallest species of Acervularia known, and that in which the septa are the 

 least numerous. A. coronata^ to which it bears most resemblance, differs from it by the 

 great inequality of the septa. 



.0. Acervularia limitata. Tab. LIV, fig. I. 



AsTREA pentagona (pars), Lonsdale, Geol. Trans., 2d ser., vol. v, pi. Iviii, fig. la, 1840. 



(Not fig. 1.) 

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



p. 419, 1851. 



A polished slab of this coral show^s that the corallites are circumscribed by well-marked 

 zigzagged polgyonal lines. The inner walls are, on the contrary, but slightly marked, 



' Tab. liv, fig. I. 2 Tab. liii, fig. 4. 



