17 



The polished surface on the other side proves that the stone is 

 almost entirely formed by this fossil : and the internal view of the 

 tubes which is thus obtained shews, that the tubipore was formed of 

 hollow tubes, which are now filled with clear spathose matter ; and 

 that there is no appearance of that internal structure which is ob- 

 servable, either in the tubipora musica, or in madrepores. In some 

 parts, may be seen, sections of the transverse pipes, which preserve the 

 communication between the several perpendicular tubes. 



The appearance of this tubipore differs considerably in different spe- 

 cimens. In a beautiful white specimen, evidently of the same species, 

 from the Marquis of Donegal's Collection, the general appearance dif- 

 fers much from the preceding fossil, Plate II. Fig. 1, partly from the 

 elegant plumose forms, which the ramifications have assumed ; and 

 partly from the whiteness of the earth, and the pureness of the spathose 

 matter, with which it has become impregnated ; it being a beautiful 

 white marble. The characteristic, minute, transverse, connecting 

 branches are very numerous and conspicuous, and plainly evince the 

 species to which it belongs. Dr. Woodward describes a specimen 

 which appears to belong to this species of tubipore. His description 

 of it is, " a fasciculus of several pieces of a grey coral, lying generally 

 parallel, and held together by means of several small branches passing 

 from one to another, and uniting where they meet. The whole somewhat 

 resembles the tubularia purpurea of Ferrante Imperati : and the stems 

 of this are of the thickness that those of that commonly are. Some 

 of them are tubular ; others solid. Found near Sedberg, in York- 

 shire."* 



* Catalogue of Fossils, Vol. I. Page 130, E. 4. 



VOL. II. D 



