14 



respects, the difference is so considerable, as fully to authorize the 

 considering of it, as of a distinct species. The perpendicular pipes 

 are similarly arranged, the internal pipes are also observable, and the 

 lateral communication takes place nearly in the same manner; but 

 here there are no continuous, connecting plates. By an attentive 

 examination of the figure, the lateral openings disposed round the 

 tubes will be observed, through which the transverse pipes of commu- 

 nication passed, in the same manner as in the tubipora musica, except 

 being unaccompanied by the horizontal plates. In this circumstance, 

 therefore, the specific difference exists between the recent tubipore 

 and the fossil species here delineated ; and which may be described as 

 a tubipore composed of erect parallel tubes, including others, which by 

 frequently radiating connect the whole. 



Specimens of this tubiporite are also found in Derbyshire and in 

 Wales, imbedded in a soft matrix from which it is easily detached. 

 In this state, its resemblance to the tubipora musica, is still more 

 striking, than when imbedded, as in the above-mentioned specimen. 

 These specimens are, in general, of a dark brown colour ; but one in 

 my collection still bears a slight reddish hue, from which their ori- 

 ginal red colour may be inferred. 



In the greater number of these specimens, so much silex enters into 

 the composition of the fossil, as to render it capable of scratching 

 glass, and of resisting the action of the muriatic and nitric acids. 

 The representation of the separate tubiporite is not given, as its figure 

 may be easily imagined from the appearance it yields in the im- 

 bedded specimen, Plate I. Fig. 1. 



In a marble formed by this species of tubipore, Plate I. Fig. 2. 

 a reddish tinge is observable, which evidently proceeds from some of 

 the original colour of the coral having been preserved. This is ren- 

 dered indubitable by a close examination of the specimen itself, since 

 it is there seen, that the colour does not exist in the intermediate cal- 

 careous matter, or in that which has been introduced into the cavities 



