Gen. Erismatolithus. Fam. Tubiporit.®. 
19 
Dish- like TIelicite. * 
Sedes : strata vetusta, marmorea, et schistosa. 
Common. 
SPECIMEN. 
b. S. complanatum. In schisto nigro. 
Obs. The flattened specimens of this fossil are not very frequent. Those we have found near 
Buxton are remarkably compressed ; their thickness not exceeding that of a shilling. In this state, 
the part which forms the broad, oblique ambit, in the limestone specimens, constitutes, as it 
were, a flat or extended border to the outward whirl. 
37. Conch. Helicites depressus laevis umbilicatus subtus convexus anfracti- pusillus. 
bus teretibus, apertura subrotunda. 
Tab. 52. Fig. 3. 
Petit Helicite. 
Sedes : strata vetula, argillacea, fertifera. 
Near Chesterfield. Rare. 
ERISMATOLITHUS. 
* Familia permanentes. 
-f. coraliorum cavernosorum. 
* a * Tubiporitse. 
1 . Erism. Tubiporites aggregatus, ramis tubulatis laterallbus horlzontalibus catenatus. 
distantibus tubulos suberectos connectentlbus. 
Tab. 42. Fig. 1, 2. 
Varietates. 
a. V. reticulata, tubis distantibus. Fig. 1. 
b. V. compacta, tubis contiguis. Fig. 2. 
Linked Tiibiporite. 
Sedes : strata vetusta, mamorea. Matrix saepe distincta, ex petrosillce et 
quartzo composita. 
Not uncommon in the limestone walls about Jshford-in-the-Waters. 
