CONCLUDING REMARKS. Lz 
have already been clearly identified on the West? Pacific coast; several of these can 
scarcely have travelled through Behring Straits, not being Boreal forms.” The 
following species, now living on the north-west coast of America, are given by 
him (‘ Brit. Assoc. Rep.,’ Newcastle, 1863) as identical with Crag forms. Those with 
an asterisk are also given as Tertiary fossils of Maryland and Virginia by Sir C. Lyell 
(‘ Proc. Geol. Soc.,’ 1845, p. 555). 
Coralline Crag Species. 
Mya truncata, Linn. * Arca lactea, Linn. 
Sphenia ovoidea (?), Carpenter. Mytilus edulis, Linn. 
*Glycimeris generosa (?), Gould (Panopea Fau- Modiola modiolus, Linn. 
jasil). Modiolaria marmorata, Ford. 
Saxicava Arctica, Linn. Lima subauriculata, Mont. 
*Tellina donacina, Linn. Hinnites giganteus (?), Gray. 
Astarte triangularis, Mont. *Hrato columbella, Carpenter. 
* —  fluctuatus, Carpenter. Cerithiopsis tubercularis, Mont. 
Miodon prolongatus (Cardita corbis). Cerithium adversum, Mont. 
*Lucina borealis, Lenn. *Bulima micans, Carpenter. 
Cryptodon flexuosus, Don. *Solariella peramabilis (’), Carpenter. 
Verticordia novem-costata (?). Margarita Vahlii (?), Moll. 
Kellia suborbicularis, Mont. *Galerus sinensis, Linn. 
Lascea rubra (?), Moné. Cylichna cylindracea, Pennen. 
Arca tetragona, Pol. — mammillata, Phil. 
feed Crag Species. 
Rhychonella psittacea. Bela fidicula. 
Macoma inquinata. — excurvata. 
Astarte compressa. Purpura saxicola (?). 
Cardium Groenlandicum. Lacuna vincta. 
Nucula tenuis. Natica clausa. 
Acila castrensis (7). Velutina leevigata. 
Leda minuta. Dentalium Indianorum. 
Yoldia lanceolata. 
Any inferences which might be drawn from the identifications of Dr. P. Carpenter in 
the case of the Pacific shells, and of Sir Chas. Lyell in the case of the United States 
1 Hast Pacific coast (7.e. west coast of America) is probably intended. 
