DESCRIPTION OF THE FOSSILS. 
213 
P. deornatus. PI. VI. fig. 26. 
This has scarcely distinguishable characters, yet contrasts with the others by its 
smooth concentric furrows. 
P. fimbriatus. Ph. PL VI. fig. 28. Castleton. 
Oblong, depressed, with small plain ears ; surface radiated with obtuse ribs and fur- 
rows, all sinuoso-imbricate. 
P. papyraceus. Sow. t. 354, is found near Harrogate and in Bolland. 
P. granosus. Sow. PI. VI. fig. 7- Bolland ; Kildare. 
Nearly orbicular, oblique ; lower valve convex, upper (fig. 7) nearly flat, radiating 
ribs numerous, alternately larger and smaller, imbricated ; ears reticulated. 
BRACHIOPODA. 
Piioducta. Until the structure of the shells of brachiopodous mol- 
lusca is better bn own, it appears prudent to retain the nomenclature of 
the late Mr. Sowerby. This genus belongs to the silurian, carboniferous, 
a nd new red sandstone systems. 
Division A. Radiating sulci or stria; predominant. 
P. Martini. Sow. PI. VII. fig. 1, and PI. VIII. fig. 19. Bolland; 
Kirby Lonsdale ; High-Green-wood; Hudswell ; Harrogate; Northum- 
berland ; Castleton. 
Globose near the beak, widening to the produced front ; radiations thread-like, 
flexuous. 
P. costata. Sow. (et sulcata Sow.) Ph, PI. VII. fig. 2. Bolland ; 
Hawes ; East Witton ; Richmond. 
Dorsally planato-concave ; ribs strong, at intervals spinose, reticulated near the 
beak ; long curved spines on the ears. 
P. antiquata. Sow. PL VII. fig. 3. Bolland ; Coverdale ; Northum- 
berland ; Cumberland; Derbyshire; Flintshire; Kildare. 
Old specimens quadrato-hemispherical ; front produced ; sides subparallel ; mesial 
hollow wide; radiating ribs round, reticulated in all the rostral portion by concentric un, 
deflations, which are larger, fewer and spinose toward the ears. Young, plano-convex ; 
their whole surface reticulate. Var. with finer sharp striae. High-Green-wood and 
Kirby Lonsdale. 
P. comoides. Sow. Pl. VII. fig. 4. Conishead ; Bolland ; Greenhow 
Globose near the beak, ears wrinkled, surface covered with fine undulating striae. 
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