Gen. Conchvliolithus. Fam. Anomit.®, 
Rough-backed Anomite. 
Sedes : strata vetusta, calcaria. 
We have lately seen some very perfect specimens of this fossil which 
were collected near Wirksworth. 
10. Conch. Anomites valva altera longitudinaliter striata gibbosa product^ 
subcylindrica alteram amplexante. 
Tab. 22. Fig. 1, 2, 3. 
Varietates. 
a. V. valva convexa tuberculis raris aspersa. 
b. Y. — — tuberculis dcstltuta. 
Lengthened Anomite. 
. Sedes : strata vetusta, calcaria. 
Common in most parts of our limestone tracts. 
Obs. It was only from repeated examination of numberless specimens, that we were able to 
acquire a just idea of the structure of this curious fossil. Xhe stone, which constantly fills the 
lengthened cylindric part of the shell, precludes the possibility of. ascertaining the form, or even 
the presence of the smaller valve, without breaking the specimen ; and then it requires a careful 
comparison of the parts thus detached from different specimens, before the real conformation of 
the original becomes apparent. 
We must observe, that the lengthened form of the large valve is not exclusively peculiar to this 
species : instances sometimes occur of scabriculus and semireliculatus, particularly the latter, 
affecting the same structure, but in a less degree ; and we have now and then found them to divide 
ithe produced part being filled with stone) in the same manner as productus. It is sufficiently 
evident, however, that this structure in scabriculus and semireliculatus is merely accidental, occa- 
sioned by the more than ordinary prolongation of the margin in particular specimens ; while in the 
present fossil the prolongation is constant, and takes invariably the same form in each individual ; 
thus constituting, without doubt, the leading characteristic of the species. 
* d. d. * Perforati, valva utraque convexa, cardine recto, ad valvam 
(plerumque) convexioiem patulo, et foramine trigona magna inter 
nates secto. 
* a. a. a. * Cardine extento. 
11. Conch. Anomites rotundo-trigonus longitudinaliter sulcatus, sinu rotun- 
dalo striato. 
productus. 
trigonalis. 
