380 



TABLE OF DISTRIBUTION. 



Species. 



Gasteropoda {continued) 



Lacuna puteolus 



pallidula 



Littorina obtusata 



neritoides 



rudis 



litorea 



54 

 Total 94 



a 



u 

 o 



51 



89 



9 



37 



74 



34 



64 



Extra-European localities. 



Greenland and North-east 

 America. 



North Africa, Madeira, and 



Canaries. 

 Both sides of North America, 

 Greenland and North-east 



America. 



Of the above species (not taking into account doubt- 

 ful cases of distribution) 71 may be considered north- 

 ern as well as southern, 19 peculiarly northern, and 3 

 peculiarly southern; this distribution is, of course, 

 irrespective of their British habitat. One species (Pho- 

 ladidea papyracea) has not yet been noticed on any 

 foreign coast. Eight other species (viz. Thracia trim- 

 cat a, Dentalium abyssorum, Piliscus commodus, Cyclo- 

 strema costulatum, Trochus cinereus, T. olivaceas, T. 

 elegantissimus, and Littorina UtoraJis or L. palliata) 

 have been noticed in the present volume as occurring 

 only in our newer tertiaries; all these still exist in high 

 northern latitudes. Such recent species as are also 

 enumerated as fossil in the list now given, comprise 15 

 peculiarly northern, and but one peculiarly southern; 

 the rest are common to both divisions. 



