or 
BRacHIopopa. | DEVONIAN MOLLUSCA. 37 
Secr. VIII.—MOLLUSCA OF MIDDLE PALAOZOIC (Devonian) ROCKS. 
3rd Sub-kingdom. MOLLUSCA. See page 185. 
2nd Class.) PALLIOBRANCHIATA. See page 185. 
2nd Order. Bracniopopa. See page 186. 
5th Family. SPIRIFERIDA. See page 191. 
Genus. SPIRIFERA (Sow.) See page 191. 
SPIRIFERA GRANDAVA (Phill.) 
Ref.—Phillips, Pal. Foss. t. 30. f. 131. 
Sp. Ch.—Subrhomboidal, depressed, cardinal angles acute, but not extending into spines; mesial ‘fold 
large, rounded, very prominent, very strongly defined quite to the beak, forming an abrupt semielliptical sinus 
in the front margin; surface radiated with thick, obtusely-rounded, simple ribs, about five in the mesial sinus, 
and about nine on each side. Width one inch five lines, proportional length of receiving valve 5. 
The shell is wider, with more pointed angles than the S. aperturata, and the mesial ribs are not obviously 
smaller than the lateral ones. It seems very closely allied to the carboniferous S. trigonalis. 
Position and Locality.—One specimen of the receiving valve collected by myself from the olive slate of 
Lanlake, Launceston, Cornwall. 
SPIRIFERA L#VicostTa (Valen. Sp.) 
Ref. and Syn.= Terebratula levicosta Valenciennes in Lamarck Anim. S. Vert. 
= Terebratulites ostiolatus Schlot. Pet. p. 258. t. 17. f. 3. 
Sp. Ch.—Rotundato-quadrate, very gibbous; hinge-line scarcely as wide as the shell; sides subparallel, 
front margin raised into a deep semielliptical sinus; mesial fold broad, distinctly defined to the beaks, without 
ribs; the mesial ridge of the entering valve smaller than the mesial sinus of the opposite one ; about fourteen 
simple obtusely-rounded ribs on each side; entire surface under the lens marked with very minute, close, 
regular, granular striz. Width one inch five lines, proportional length of receiving valve ;;, of entering valve 4, 
depth =. 
Mr Davidson has figured Lamarck’s (or Valenciennes’) original type specimen in the Annals of Natural 
History for 1850 (t. 15. f.41), so that no doubt can remain of its specific identity with that subsequently figured 
and described by Schlotheim. 
Position and Locality —In hard Devonian schists of Valley of the Rocks, N, Devon. 
