TABLE OF DISTRIBUTION. 467 



This Table (excluding doubtful cases) shows, with 

 regard to the British seas, 114 northern and southern, 

 46 peculiarly northern, and 12 peculiarly southern 

 .species; 10 other species have not yet been noticed on 

 any foreign coast. The following species occur in our 

 newer tertiaries, viz. : — Turritella j)olaris, T. reticulata, 

 Scalaria Groenlandicaj Acirsa borealis, Natica affinis, 

 N. Smit/iii, Velutina undata, V. lanigera, Trichotropis 

 insignis, Admete viridula, Cerithium tuberculatum, Buc- 

 cinum Groenlandicum, B. plicosum, Trophon clathratus, 

 T. craticulatus , Fusus despectus, F. latericeus, Columbella 

 Holbdllii, Pleurotoma pyramidaliSj Cylichna striata, and 

 Philine lima ; all these, except Cerithium tuberculatum, 

 inhabit the arctic seas. Of the species given in the 

 present Table as fossil, 24 are peculiarly northern, and 

 4 peculiarly southern; the rest are common to both 

 divisions. 



