120 
SPIRIFER octoplicatus. 
TAB. DLXII. —Jigs. 2 , 3, & 4. 
Spec. Char. Transverselyeiongated, gibbose, semi- 
circular, plaited ; plaits 8 or 10, deep and an- 
gular ; central elevation plain ; beaks remote, 
incurved ; area triangular, curved. 
A neat shell, strongly marked by the depth and small 
number of its plaits. 
Collected in Derbyshire by the author of a Petrificata 
Derbyensia but it does not appear to be figured in that 
work. 
Fig, 4. represents a larger specimen from the same 
place, with a striated or rather imbricated surface ; but 
in other respects strongly resembling the small ones. 
May additional specimens prove it to be a distinct spe- 
cies ? 
SPIRIFER triangularis. 
TAB. DLXII.-; figs. 5 & 6. 
Spec. Char. Triangular, transversely elongated, 
convex, radiated ; extremities acute; front 
angular, with an acute elevation ; radii about 
16, obtuse ; area narrow, flat, 
Syn. Conch. Anomites triangularis. Martin , Pet. 
Derb.t.36.f. 2. 
Readily known by the straight lines that form its out- 
line. 
From the collection of the late Mr. Martin. Fig. 6. 
is from a remarkable specimen with dissimilar sides. 
