On tlie 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 MoUusca for me ; Mr H. B. Brady, of JSTewcastle, 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 will 
occur, and they belong to me ohly. 
Bivalves. 
Khynchonella psittacea, 
Pecten islandicus, 
Ostrea edulis, * * . . 
Anomia ephippium, var. squamula, 
Mytilus edulis, . . , . 
modiolus, 
Crenella decussata, 
Nucula nucleus, . . . . 
sulcata, . . . . 
Cardium edule (of the Bridlington 
exiguura, 
Cardium fasciatum, 
Leda pernula, var. baccata, 
pygmoea, . 
minuta, . i 
Lucina borealis, . 
spinifera, . 
Astarte sulcata, var. Scotica, 
borealis, Jiin , . 
Venus gallina, 
lincta, 
casina, . , 
ovata, 
^" Since the above was read, death 
VOL. in. 
List or Organisms. 
JBrachiopoda, 
Ranges. 
. Arctic Seas. 
. Arctic Seas, 
Iceland, Norway, Ts^aples. 
Iceland, Norway, ^gean. 
Polar Regions and ^gean. 
Behring's Straits, S. of England. 
Arctic Seas, Yorkshire. 
, Norway, ^gean. 
Norway, -^gean. 
I Iceland, Norway, JEgean. 
. Norway, ^gean. 
Norway, Azores. 
Norway and Sweden. 
. Spitzbergen, Skye. 
. Arctic Seas, South of England. 
Iceland and Norway, Sicily. 
Norway, Canary Islands. 
Norway, ^gean, Canary Islands. 
. Polar Regions, Kiel Bay. 
. Iceland and Norway, Sicily. 
Iceland and Norway, ^gean. 
. Norwaj^, Canary Islands. 
. Norway, ^gean. 
as taken this estimable naturalist away. 
3 F 
