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 communication passed, 
in the same manner as in the tubipora musica, except being unac- 
companied 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 original 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 imbedded 
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 rendered 
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 
