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IV. Account of fome Species of Foffil Anomie found in Derbyfire. By 
Mr. William Martin, F.L.S. 
Read April 5, 1796. 
MONG the petrifactions of Derbyfhire, which I have beer 
drawing and defcribing for fome time paft, there appear to 
me none more worthy of a careful examination than thofe foffil 
fhells, generally referred by authors to the family of Anemia: the 
variety of form the different fpecies exhibit, and the prodigious 
quantity of fome of thofe fpecies our limeftone /rata afford, muft 
ftrike even a cafual obferver as curious circumftances, and certainly 
well deferve the attention of the Naturalift. Though my own re- 
fearches, in regard to this genus of foflil exwvie, have been indirect 
and imperfeét, it has chanced that a great variety of {pecimens,, 
within this year or two, has paffed through my hands: among 
thefe I reckon near thirty diftint fpecies, feveral of which feem to 
have efcaped the notice of authors. The Anomia delineated in the 
annexed tables, is one I fuppofe to be as yet undefcribed. It ap- 
pears to have been a curious fhell; its form is very fingular; and 
the perforation, which is placed in what is commonly called the upper 
valve, differs from that of every other foffil {fpecies I have yet feen, 
in refpect to its fuperior fize, as well as its fituation. 
DESCRIP- 
