380 



TABLE OF DISTRIBUTION. 



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 trun- 

 cata, Dentalium abyssorum, Piliscits commodus, Cyclo- 

 strema costulatum, Trochus cinerem, T. olivaceus, T. 

 elegantissimuSy and Littorina litoralis or L. pattiata) 

 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. 



