30 BRITISH FOSSIL CORALS. 



Family ASTREIDjE (p. xxiii). 

 Tribe EUSMILIrLE (p. xxiii). 



(Eusmilince aggregate). 



1. Genus Styloccenia (p. xxix). 

 Styloccenia emarciata. Tab. V, figs. 1, 1 a. 



Astroite demi-cylindrique, Guettard, Mem. sur les Arts et les Sciences, t. iii, p. 480, 



tab. xxxi, figs. 40, 41, 42, 1770. 

 Astrea emarciata, Lamarck, Hist, des Anim. sans Verteb. t. ii, p. 266, 1816; 2 me edit, 

 p. 417. 



— — Lamouroux, Encyclop. Zooph., p. 127. 1824. 



— — Defrance, Diet, des Scien. Nat., t. xlii, p. 389, 1826. 



— cylindrica, Ejusd., loc. cit., p. 379. (From a worn specimen.) 



— stylopora, Goldfuss, Petref. Germ., vol. i, p. 71, tab. xxiv, fig. 4, 1826. (From a 



frustrate specimen.) 



Cellastrea emarciata, Blainville, Diet, des Sc. Nat., vol. Ix, p. 342, 1830 ; and Manuel 



d'Actinologie, p. 377. (Tbe fossil figured in tbe atlas of this 

 work, pl.liv, fig. 5, under the name of Cellastrea hystrix, 

 belongs to this species.) 



Astrea emarciata, Michelin, Icon. Zooph., p. 154, tab. xliv, fig. 6, 1844. 



— cylindrica, Ejusd., op. cit., tab. xliv, fig. 4. 



— decorata, Ejusd., op. cit., p. 161, tab. xliv, fig. 8. 



Styloccenia emarciata, Milne Edwards and /. Haime, Monogr. des Astreides, Ann. des 



Sciences Naturelles, 3 me serie, vol. x, p. 293, tab. vii, figs. 2, 2 a, 

 1848. 



It is only in the Eocene deposits of the Parisian basin at Grignon and at Parnes that 

 this species has as yet been met with in a good state of preservation, but its existence in 

 the London clay is sufficiently established by two small fossils found at Bracklesham Bay, 

 by Mr. Frederick Edwards, which do not appear to differ from the worn specimens found, 

 together with the well-characterised ones in the first -mentioned localities. The following 

 description is consequently derived principally from the Parisian specimens ; but in order 

 to avoid introducing into this Monograph any uncertain elements, we have figured the 

 British specimens in preference to more perfect foreign fossils with which we consider them 

 as being specifically identical. 



Astrea emarciata is a composite Coral, of an oval, gibbous, or subramose form, which at 

 first sight appears to be completely free, but was in all probability primitively fixed on 

 some soft, globular, extraneous body, which after having been completely covered by the 

 incrusting Coral, disappeared by the progress of putrefaction, and has only left a central 

 cavity in the middle of the irregular globose mass thus produced : it consists of a thick 



