PLATE 1. 



FIG. 1. A tubiporite, somewhat approaching to the Tubipora Musica, imbedded in a 

 dark coloured limestone, from Derbyshire, p. 13. 



2. A piece of marble, chiefly formed by a tubiporite of this species. This marble 



has a red tinge, apparently from the original colour of the coral. 



3. The remains of a fragment of marble of the preceding kind. In consequence of 



having been exposed to the action of dilute muriatic acid, the lapideous part of 

 the marble has been removed, the animal membrane of the coral, still retaining 

 its colour, only remaining. 



