BOREAL PROVINCE. 359 



* Chiton albus. Natica clausa. 

 *Dentalium (entale, L.?) * „ pusilla. 



? Lepeta caeca (Candida, C.) *8calaria grosnlandica. 



*Acmaea testudinalis (amoena, S.) (lauthina communis). 



*Puncturella Noachina. Odostomia producta. 



*Adeorl)is divisus (= Skenea serpu- Cancellaria (admete) viridula. 



loides). *Tricbotropis borealis. 



Mai-garita cinerea. *Fnsus antiqnus (tornatns). 



* „ costiilata? (Skenea). * „ islandicus. 



* „ helicina. * „ propinquus. 



* „ undulata. „ ?rosaceus. 



* „ alabasti-um (= occidentalis?) *Trophon muricatus. 

 Litorina groenlandica. * „ clatbratus. 



* „ tenebrosa (vestita). „ scalarifonnis. 

 „ palliata? „ harpularius. 



*Lacuna vincta (divaricata). *Pui-pura lapillus. 



* „ puteolus (Montagui). *Buccinum undatum. 

 *Skenea planorbis. * „ (Cominella) Dalei. 

 *Velutina laevigata. *Bela turricula. 



„ zonata. * „ Trevelyana. 



*Lamellaria pei-spicua. * „ I'ufa (Vablii) ? 



* Natica helicoides. 



* Ommastrephes sagiUatus di.'iidi *CyntJda microcosmus are also common to 



both sides of the North Atlantic. The genera, 



3Iachcera, Glycimeris, Cardita, and 



Solemya, Mesodesma [deavratum). 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 chiereus. Say., is believed to be the Fasus Forbesi, 

 Strickland, of the Isle of Man ; others are marked in the Arctic list. 



III. Celtic Province. 



The Celtic province, as described by Prof. E. Porbes, includes the British 

 island coasts, Denmark, Southern Sweden, and the Baltic* The fauna of this 

 region (which includes the principal herring-fisheries) is essentially Atlantic ; 

 many of the species are of ancient origin, being known fossil in the Pliocene 

 Tertiaries. 



The British mollusca described by Forbes and Hanley amount to 682, 

 viz. : — 



14 Cephalopoda. 100 Pulmonifera. 175 Acephala. 



220 Marine Univalves. 4 Pteropoda. 73 Tunicata. 



91 Nudibranchiata. 5 Brachiopoda. 



Of this number two-thirds of the Nttdibranches, 55 marine univalves, and 



* The great work of Messrs. Forbes and Hanley contains all that is known 

 respecting British Testacea up to the present time. The Nudibranchiata alone have 

 been more fully described, in the publications of the Ray Society, by Messrs. Alder 

 and Hancock. For the marine zoology of the coasts of Denmark the " Zoologia 

 Danica" of O. F. Miiller is still the most important work. 



