GEOLOGICAL DISTRIBUTION OF SHELLS. 439 
—Oorrrz. Ly. p. 257. 
Grypheea virgula; Ly. fig. 268. 
Ostrea deltoidea (Kimmeridge Clay) ;—fig. 269. 
Trigonia gibbosa ;—fig. 270. 
elavellata ; Lign. 127. 
costata; Lign. 127. 
Nerina Goodhallii; Ly. fig. 274. 
Diceras arietinum ;—fig. 275. 
Pleurotomaria ;—fig. 299. 
Terebratula spinosa ;—fig. 297. 
digona ;—fig. 283. 
Ostrea Marshii ;—fig. 300. 
Phasianella Heddingtonensis ;—fig. 58. 
Many of the characteristic shells of the Oolite and Kimmeridge 
Clay, are figured in Plates XXII. and XXIII. of Dr. Fitton’s Memoir 
on the Strata below the Chalk; Geol. Trans. New Series, vol. iv. 
The fossil shells of the Great Oolite are figured and described by 
Messrs. Morris and Lycett, in the Memoirs of the Paleontographical 
Society ; and valuable Papers on the Brachiopods of the Oolite and 
Lias, by Mr. Davidson, have been published by the same Society. 
WEALDEN AND PurBECK. Wond. vol. i. Geol. 8S. E., Foss. Tilg. For., 
and Ly. p. 225. 
Melanopsis; Wond. pp. 401 and 404. 
Cyclas ;—p. 404. 
Paludina Sussexiensis ;—p. 401. 
Neritina Fittoni ;—p. 401. 
Mytilus Lyellii;—p. 405. 
Unio antiquus; Geol. S. E. p. 250, fig. 1. 
compressus ;—fig. 2. 
aduncus ;—fig. 3. 
porrectus ;—fig. 4. 
Valdensis ;—Min. Conch. pl, 646, and Lign. 131. 
Corbula alata; Ly. p. 229. 
Ostrea distorta ;—p. 232. 
- he shells of the Wealden are also figured by Dr. Fitton, Geol. 
Trans. New Series, vol. iv. Pl. XXI. 
