42 
posed. I conceive that all those in Martin’s division of 
Anomite d. d. (Martins’s outlines, &e. p- 243.) which he 
describes as having both valves convex, and a large tri- 
gonal foramen belong to this Genus, and also, perhaps, 
those of his next section with a small foramen, but we 
are not sufficiently acquainted with their internal struc- 
ture, to decide whether another Genus may not be neces- 
sary to render the divisions of the Linnean Genus Ano- 
mia quite natural. 
SPIRIFER cuspidatus. 
Spec. Cuar. Inversely pyramidal, longitudi- 
nally suleated; back flat, triangular, equila- 
teral; front elevated by a semicircular sinus, 
corresponding to a large longitudinal rising in 
the upper, and depression in the lower valve. 
Syn. Anomia cuspidata. W. Martin mm Trans. 
of Linn. Soc. IV. p. 45. t. 3. 
andt.4.fig.5. Petrif. Derb. 
t. 46. &A7. fig. 3. 4. and 5. 
Terebratula. Parkinson Org. Rem. III. 
234. t. 16. fig. 17. 
Drien valve nearly flat at the back, because its beak is 
but slightly incurved, or is straight, and sometimes even 
it is recurved; its depth is equal to its greatest width, 
which is occupied by the line of the hinge; the other 
valve is about one third the depth: the length is equal to 
about one half the width; the edge semicircular; there 
