CORALS FROM THE CORAL RAG. lOl 



and Mr. Morris had entered it in his Catalogue as having been met with in the Liferior 

 Oohte of Cheltenham. We have also seen in Mr. Walton's collection a fossil from the 

 Inferior Oohte of Coomb Hay, which does not appear to differ specifically from the T. 

 concinna of the coral rag. Some other specimens of the same species, belonging to M. 

 Michelin's collection, were found in the coraUine formation at Stenay, in the Department 

 des Ardennes, and those which we have seen in the Museum of Bonn were from Giengen 

 and Natheim. 



The British specimens which we have examined were communicated to us by the 

 Geological Society, Sir H. De-la-Beche, Mr. Bowerbank, Mr. Walton, Mr. Sharpe, and 

 Mr. Pratt. The one figured in Plate XVHI belongs to the Paris Museum. 



This species is remarkable for the small size of the calices, and by that character alone 

 can be easily distinguished from most Thamnastrea ; most especially from T. arachioides} T. 

 fungiformis^' T. Defranciana,^ T. Terquemi,^ and T. mettensis ;^ it also differs much by its 

 general form from T. dendroidea^ T. affinis^ T. Li/elli,^ T. mammosa^ T. Waltoni}'^ and 

 T. cadomensis}^ which are all much taller and more mamillose. In T. scita^" the septa 

 are much more delicate and more numerous. By its general aspect it bears a great resem- 

 blance to T. tenuissima}'^ but in the latter the septa are thinner and less unequal in size. 



Family FUNGID^, (p. Ixv.) ' 

 Genus Comoseris.^* 



CoMOSElUS IRRADIANS, Tab. XIX, figs. 1, 1«, \h, \c, Id. 



SiDERASTREA MEANDRiNOiDEs, M'Coij, Ann. of Nat. Hist., s. ii, vol. xi, p. 419, 1848. 



Corallum massive, thick, orbicular, or sublobate, and free or fixed by a small portion of 

 its basal plate, which is covered with a complete epitlieca, presenting circular thick wrinkles 

 or accretion folds. The upper surface convex, uneven, and usually divided into a certain 

 number of irregular radiating valleys, by elevated ridges, which much resemble those of 

 Meandrina, and more especially those of Aspidisms. Most of the ridges are straight or 

 slightly flexuous, and often meet towards the centre of the corallum, but become more 



' Tab. xvii, fig. 1. " Tab. xxx, fig. 4. ^ Tab. xxix, figs. 3, 4. 



* Tab. xxx, fig. 2. * Tab. xxx, fig. 3. 

 ® Astrea dendroidea, Lamouroux, Exp. metli., pi. Ixxviii, fig. 6. 



7 Milne Edw. and J. Haime, Ann. Sc. Nat., 3'"'ser., vol. xii, p. 198. 



* Tab. xxi, fig, 4. » Tab. xxiii, fig. 3. 'o Tab. xxix, fig. 4. 

 '^ Astrea cadomensis, Micheliu, Icon., pi. xciv, fig. 4. 



'- Tab. xxiii, fig. 4. 



'3 Sijnastrea tenuissima, Milne Edw. and J. Haime, Ann. Sc. Nat., 3""" sei'., vol. xii, p. 191. 



1* D'Orbigny, Note sur des Polyp. Fossilcs, p. 12, 1849. 



