PLATE 30, 31. 
2. The same in a different ' position, showing the oppo- 
site extremity. Chert. 
There is another coral in Derbyshire, which resembles 
the present one in every respect, except in its apertures. 
These are concave, and reticulated, but simple and des- 
titute of any spreading margin. At present I consider these 
fossils as distinct: they may perhaps, however, prove to be 
only varieties of the ^ame species. 
FIG. 3. 
ERISMATOLITHUS Madreporites (affinis) con- 
sociatus, stirpulis cauliformibus subramosis l^vibus 
subflexuosis, stellis terminallbus concavis reticulatis. 
S. p. 
Differs from E. Madreporce cespitoste (t. 17.) in the stirps 
being proportionably thicker, smooth, without striae, and 
less matted, or more distinct from each other. To this 
we may add, the form of the branches, which are always 
cylindric and equal, and not so flexuose as those of E. M. 
cespitusa, of which, however, it perhaps ought to be con- 
sidered only a variety. 
Not very common. It is found near Winster, and some 
other places. 
o 
