220 SUPPLEMENT TO THE CRAG MOLLUSCA. 
Nore B.—The ten species from Walton are the following, viz. Nassa conglobata, African; N. granu- 
lata, Japanese ; Act@on Etheridgu, which Mr. Jeffreys speaks of as identical with a species (ewilis) from the 
Atlantic abyss; Trophon costifer, from the same abyss; Scalara subulata, which Mr. Jeffreys mentions 
from Teneriffe ; Gastrana laminosa, South African; Cardita scalaris, Pacific; Mactra deaurata, which 
seems to me to be M. Jauresii of the United States Coast; and Buccinum glaciale and Solen gladiolus, 
which are Arctic. 
Norz C.—The twenty-two species from the Red Crag other than Walton are the following, viz. 
Nassa granulata, Japanese; Gastrana laminosa, South African; Trochus multigranus, reported by Mr. 
Jefireys from the Atlantic and from the Scandinavian Coast ; Trophon costifer, from the Atlantic abyss; 
Cardita scalaris, Pacific ; Nassa propingua (trivittata ? Say), Pleurotoma bicarinata, Cardium pinnatulum, 
and Mactra deaurata (M. Jauresit), from the coast of the United States; and Buccinum glaciale, Trophon 
Sarsu, T. sealariformis, Pleurotoma pyramidalis, P. violacea, Cancellaria viridula, Amaura candida, Natica 
occlusa, Leda lanceolata, L. oblongoides (L. Arctica? Gray), Cardium Grenlandicum, Tellina lata, and 
Solen gladiolus, which are Arctic. 
Norn D.—The twelve species from the Fluvio-marine Crag are the following, viz. Cardita scalaris, 
Pacific; Pleurotoma bicarinata, United States Coast; Trophon Costifer, from the Atlantic abyss ; and 
Pleurotoma pyramidalis, Cancellaria viridula, Velutina undata, Leda lanceolata, L. oblongoides (L. 
Arctica ? Gray), L. myalis, Cardium Grenlandicum, Astarte borealis, and Tellina lata, which are 
Arctic. 
Notre E.—The nine species from the Chillesford beds are the following :—Cardita scalaris, Pacific ; 
Corbula contracta, United States Coast; and Watica occlusa, Margarita argentata, Leda lanceolata, L. 
oblongoides (L. Arctica ? Gray), Cardium Grenlandicum, Astarte borealis, and Tellina lata, which are 
Arctic, 
Nort F.—The four Lower Glacial species are—Leda oblongoides (L. Arctica? Gray), L. myalis, 
Astarte borealis, and Tellina lata, all of them Arctic. 
Notr G.—The ten Middle Glacial species are the following, viz. Nassa granulata, Japanese ; Cardita 
scalaris, Pacific; Corbula contracta, United States Coast; and Trophon scalariformis, Leda lanceolata, 
L. oblongoides (L. Arctica? Gray), Cardium Islandicum, Astarte borealis, Venus fluctuosa, and Tellina lata, 
which are Arctic. 
Note H.—The twenty-three Upper Glacial species are, Columbella Holbollii, Trophon Sabini, T. 
ventricosus, T. craticulatus, T. scalariformis, T. Gunneri, Pleurotoma elegantior (P. elegans? Moll.), 
P. pyramidalis, P. scalarts, Trichotropis insignis, Turritella erosa, Natica occlusa, Margarita elegantissima, . 
Pecten Islandicus, Leda caudata, L. pernula, L. oblongoides (LL. Arctica ? Gray), Cardita borealis, Cardium 
Islandicum, Astarte borealis, A. crebicostata, Venus fluctuosa, and Tellina lata, all of them Arctic. 
Nore I.—The four Post-glacial species are, Zrophon scalariformis, Pleurotoma pyramidalis, Astarte 
borealis, and Tellina lata, all of them Arctic. 
The results of the table indicate an almost identical percentage of forms not known 
as living in the case of the older Red Crag and the Coralline, which is in conflict with the 
geological break, which I still believe to exist between the two formations. With the 
