120 
SPIRIFER octoplicatus. ° 
TAB. DLXII.—figs. 2, 3, & 4. 
Spec.Cuar. Transversely elongated, 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 “ 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 ? 
en ae 
SPIRIFER  triangularis. 
TAB. DLXII.—/figs. 5 & 6. 
Spec. Cuar. 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. 
Reapiy 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. 
