On t7ie Boulder Clay of Caithness, 



401 



water shells, are very rare indeed, represented many of them 

 by single specimens only. 



In taking leave of the subject, permit me to mention the 

 kindness of the following authorities for their valuable and 

 ready assistance in their various departments. First, to Mr 

 J. Gwyn Jeffreys, who has again and again examined parcels 

 of Mollusca for me ; Mr H. B. Brady, of Newcastle, the 

 Foraminifera ; and his brother, Mr G. S. Brady, of Scar- 

 borough, the Entomostraca ; and my old friend Mr Alder, 

 of Newcastle,* for much advice. To each and all of these I 

 am under great obligations. None of these gentlemen are 

 to be held responsible for any errors that may creep into 

 this paper or lists ; unfortunately, with all care, they wall 

 occur, and they belong to me only. 



Bivalves. 

 Rhynchonella psittacea, 

 Pecten islandicus, » 

 Ostrea edulis, t t 

 Anomia ephippium, var. 

 Mytilus edulis, 



modiolus, 

 Crenella decussata, 

 Nucula nucleus, . 



sulcata, . 



List of Organisms. 

 Brachiopoda. 



Ranges. 

 . Arctic Seas. 

 ; . Arctic Seas. 



Iceland, Norway, Naples, 

 squamula, Iceland, Norway, iEgean. 



. Polar Regions and iEgean. 



Behring's Straits, S. of England. 

 Arctic Seas, Yorkshire. 

 . , Norway, iEgean. 

 Norway, iEgean. 



Cardiura edule (of the Bridlington ) T , , , XT — , 



Beds) f ce * an< ^' ^ orwa 7? iEgean. 



Norway, iEgean. 

 Norway, Azores. 

 Norway and Sweden. 

 Spitzbergen, Skye. 

 Arctic Seas, South of England. 

 Iceland and Norway, Sicily. 

 Norway, Canary Islands. 

 Norway, iEgean, Canary Islands. 

 Polar Regions, Kiel Bay. 

 Iceland and Norway, Sicily. 

 Iceland and Norway, iEgean. 

 Norway, Canary Islands. 

 Norway, iEgean. 



* Since the above was read, death lias taken this estimable naturalist away. 

 vol. nr. 3 p 



exiguum, 

 Cardium fasciatum, 

 Leda pernula, var. baccata, 

 pygmcea, . 

 minuta, . g 

 Lucina borealis, . 



spinifera, . 

 Astarte sulcata, var. Scotica 



borealis, Jun , , 

 Venus gallina, . ; 

 lincta, 

 casina, 



ovata, . : 



