PLATE XII. 
Fig. 1. A fossil body, found near Bath, the surface of which is nearly covered by 
stelliform markings, which seem to have been formed by a coralloid resembling 
that which is observed on the fossil. Fig. 2. 
2. A coralloid fossil, from St. Peter’s Mountain, near Maestricht, the nature of 
which has not been determined. This, and the other fossils from this 
mountain. Fig. 4, 6, 11, and 13, have been considered as casts ; but this 
opinion appears to be incompatible with the numerous fibrillse which exist in 
this specimen, ft, a magnified representation of one of the stellated columns. 
3. A silicious fossil from Essex, apparently of a similar nature with the fossils 
represented Plate VIII. Fig. 1, 8, and 10. 
4. A coralloid fossil from St. Peter’s Mountain, the original nature of which has not 
been determined. 
5. A flint, containing an alcyonite from Southend, Essex. 
6. A coralloid fossil from St. Peter’s Mountain, the original nature of which has not 
been determined, a, the appearance yielded by one of its protuberances 
when viewed with a lens. 
7. A silicious alcyonite from Sewardstone, Essex. 
8. A calcedonic alcyonite from France. 
9. An alcyonite of curious structure, in flint, from Essex ; its substance, disposed 
in undulating plicrn, appeared to be capable of lengthening and contracting 
by the extension or the corrugation of its folds. 
10. A silicious alcyonite, found in the neighbourhood of Islington. 
11. A fossil from St. Peter’s Mountain. In this fossil, the alcyonic structure, already 
noticed in the fossil, Plate X. Fig. 1, 2, 3, and 4, is very evident : at d, is 
seen the inner side of the superior concave surface, a part of which is shewn, 
slightly manifested at /; at e, is seen the flat inferior surface. From the 
appearances yielded by this fossil, it appears to be probable that the other 
fossils from St. Peter’s Mountain, figured in this Plate, may have all partaken 
more of the nature of alcyonia than of corals. 
12. A flint, supposed to owe its figure to an alcyonium. 
13. A coralloid fossil from St. Peter’s Mountain, the nature of which has not been yet 
determined : the marks on some parts of its surface, as shewn magnified at c, 
seeming to point out some resemblance to a microscopic tubipore, whilst the 
ruder and more numerous forms do not appear to be referrible to any known 
form of organization. 
