M. DESHAYES's TABLES OF SHELLS. 397 
Column 4 gives the name of the species Solen vagina, because 
that species is found both living and fossil. 
„ 5 is left blank, because the names of those species only are 
placed in this column which have no living analogues, 
but are found in more than one period, or in more than 
one formation of the same period. [Thus, in the next 
line, Solen siliquarius has no living analogue, but it 
occurs in two formations of the Miocene period, viz. at 
Bordeaux and in Touraine.] 
„ 6 shows that the living species of Solen vagina inhabits the 
European Ocean and Mediterranean. 
, The two asterisks in the column of the Pliocene period show that the 
species is found in two formations of that period, viz. in the Subapennine 
hills and the English crag. 
The asterisk in the column of the Miocene period shows that this spe- 
cies is found in the basin of Vienna. 
The word Baden in the next column indicates that the species is also 
found fossil in that locality. 
The column of the Eocene period is blank, because the shell has not 
been found in any formation belonging to that period. 
The figures in the column of localities will be understood by what we 
said above. In summing up these figures it will be found that they 
amount to thirty-one, whereas it is stated, in the third column of the left- 
hand page, that only nineteen fossil species have been found. The dis- 
agreement arises from this— that the same species occur in more than 
one locality, and thus come to be counted more than once in the column 
of localities. 
N. B. In some cases, before the totals of the species in the columns of 
localities can tally with the figures in the third column, the species enu- 
- merated in the supplementary table of localities, p. 46, must be taken into 
account. 
A note of interrogation added to the asterisk (*?) indicates a doubt 
as to the correct identification of the shell, either because the shell is a 
variety which has a somewhat distant analogy to the recognized type of 
