1 consider it to be of the same genus, for I do not consider 
it right to run the risk of spoiling the only one I have seen 
in search of internal evidence. I hope other specimens will 
soon be found, now that notice is taken of the peculiar 
structure of the genus, which will clear all doubts. 
PENTAMERUS lams. 
TAB. XXVIII .— Right hand Figure . 
Spec. Char, Smooths triangular^ front rounding, 
beaks incurved. 
Much less gibbous than either of the last ; free from fur- 
rows, but having slight depressions over the septa ; length 
generally less than an inch. 
Not having found this in a perfect state, although I 
have had stones including hundreds of specimens, I have 
been doubtful whether I ought to admit it. The Rev. Dr. 
Abbot, of Bedford, in May, 1812, was so kind as to bring 
me pieces of rolled Limestone, with these small dividing 
shells, from near Hopton Court, where he thought they 
appeared to be left by the swell of the river Teme, and 
formed a bank three feet or more high. 
Sometimes I think there are two species in the stone, a 
smooth and a furrowed one, but better chance than I have 
had must determine this ; at the same time the formation is 
distinctly characterized. 
The same stones contain the remains of Madrepores. 
The specimen figured is from Bildwas, Shropshire, col- 
lected by A. Aikin, Esq. In some of his specimens I 
perceived the imperfect remains of small Entrochi. 
