6 
Gen. Conchyliolithus. Fam. Anomit.5. 
giganteus. 
4. Conch. Anomites transverse oblongus lateribus dilatatus, longitndmaluej 
sulcatus striatusque: striis scabrlusculis irregularibus, valva alter* 
gibbosa. 
Tah- IS. Fig. 1. 
Varietates. 
а. V. striis sulcisque subflexuosis obsolete tuberculatis. 
б. V. rectioribus ; tuberculis raris. 
Gigantic Anomite. 
Sedes ; strata vetusta, calcaria. 
In many parts of the county, particularly near Buxton. 
SPECIMINA. 
b. S. subdecorticatum, punctis excavitis sparsis obsituin. 
c. S. decorticatuin Iteviusculum, valva convexa gibbis quatuor instructs- 
duabus laris prope natcm : duabiis magis elevatis marginem versus- 
Nucleus. 
Obs. This species varies considerably in its form, as well as in its external markings. I® 
the most common variety, the sides are generally more extended than in h, the furrows less reg“ 
lar, and in some specimens almost obsolete. The strise, also, irregular and unequal, frequeP*')^ 
crossing the furrows, instead of running parallel with them ; and the tubercles, with which they 
are roughened, numerous and crouded, rising in most parts of the surface. In i, the strise a 
furrows take a more regular form ; while the tubercles, though less numerous, are generally 
prominent than in a ; and frequently found only on each side of the beak. Specimens of be 
varieties occur mostly in a shattered state, divested, more or less, of their proper crust, or tbal 
part of the fossil matter which has immediately taken the form and place of the external surface 
the original shell. The larger valve, which alone remains in any degree perfect in the petrifactio"’ 
appears to have been very thick and strong, in the recent state, and to have consisted of seve 
coats or layers : these, as far as may be judged by the fossil, were not externally imbricated, ** 
in the structure of the common oyster, and many other bivalves, but were continued, each d'® 
tinct and separable, from the hinge to the margin. In the petrifaction, these separate latncU^ 
form distinct crusts of stone, which, when broken, occasion the shattered, laminated appearab*^* 
which most specimens of this fossil exhibit. The under layers have generally their surface sprink 
with hollow points instead of tubercles ; and hence arise specimens similar to h. It is propC 
remark, that this tunicated structure is not altogether peculiar to giganteus : we have observed > 
to take place sometimes in other anomitee of the same division ; particularly in crassus andff’ 
ductus. It is not constant, however, in any of these fossils ; not even in the present species 
we have met with specimens, in which no appearance of it could be traced. 
