BOREAL PROVINCE. 
*Crenella nigra. 
foe Giscors, L. 
“ol ae decussata (glandula, Tot.) 
Pecten Islandicus. 
? Ostrea edulis (borealis, Lam. ?) 
* Anomia ephippium. 
* ,, aculeata. 
»  squamula? 
* Terebratulina caput-serpentis. 
*Rhynchonella psittacea. 
*Dendronotus arborescens. 
Polycera Lessonii? 
? Amphisphyra hyalina (debilis ‘ ) 
Cylichna alba (triticea, C.) 
* ,, obtusa (pertenuis). 
*Philine quadrata (formosa, St.) 
*Chiton cinereus. 
* 5,  Marmoreus. 
® 645. ruber. 
= ;, levis. 
* , asellus. 
*,, albus. 
*Dentalium (entale, L.?) 
? Lepeta czeca (candida, C.) 
*Acmea testudinalis (amoena, S.) 
*Puncturella Noachina. 
* Adeorbis divisus (= Skenea serpuloides). 
Margarita cinerea. 
* 5 costulata ? (Skenea). 
* r helicina. 
61 
*Margarita undulata, 
* % alabastrum (= occidentalis ?) 
Litorina groenlandica. 
* »  tenebrosa (vestita). 
»  palliata? 
*Lacuna vincta (divaricata). 
35 puteolus (Montagui). 
*Skenea planorbis. 
* Velutina levigata. 
9 zonata. 
*Lamellaria perspicua. 
*Natica helicoides. 
»  clausa, 
* ,, pusilla. 
*Scalaria greenlandica. 
(Janthina communis). 
Odostomia producta. 
Cancellaria (admete) viridula. 
*Trichotropis borealis. 
*Fusus antiquus (tornatus). 
* ,, islandicus. 
* 4, propinquus. 
»  Prosaceus. 
*Trophon muricatus. 
* 4, clathratus. 
»  scalariformis. 
» larpularius. 
* Purpura lapillus. 
*Buccinum undgtum. 
* A (Gominella) Dalei. 
*Bela turricula. 
* ,, Treveryana, 
* ,, rufa (Vahlii) ? 
*Ommastrephcs sagittatus is also common to both sides of the 
North Atlantic. The genera, 
Machera, Glycimeris, 
Solemya, 
Mesodesma (deauratum), 
Cardita, and 
Crepidula, 
are peculiar to the American side of the Boreal Province. 
Several other species now living on the coast of the U. States 
occur fossil in England: e.g. Trophon cinereus, Say., is believed 
to be the Fusus Forbest, Strickland, of the Isle of Man; others 
are marked in the Arctic list. 
III. Cxrttic PROVINCE. 
The Celtic province, as described by Prof. EH. Forbes, includes 
the British island coasts, Denmark, Southern Sweden, and the 
Baltic.* The fauna of this region (which includes the principal 
* The great work of Messrs. Forbes and Hanley is the standard text book on 
British Testacea, Anew work on British Mollusca is now being prepared by sur, we 
