A . T E R T 1 A R Y . 



The following is intended merely as a check list, 

 and for labels ; supplementing the " Geographical 

 Catalogue of Mollusca," published in 1867. As 

 full details of the distribution of the species are 

 given in Vol. II of the Paliieontologj, it is unneces- 

 sary at present to add this to the catalogue ; espec- 

 ially as every new collection shows that the subject 

 is still fcir from being thoroughly worked up. 



Some of the older species, not positively recog- 

 nized in the Survey Collections, are referred with a 

 ? to the numbers of the " Geographical Catalogue," 

 with which they are supposed, by Messrs. Gabb, 

 Carpenter, or Cooper, to be probably identical. To 

 prevent confusion of numbers, the extinct Tertiary 

 commence with 1000. The order is changed from 

 the Synopsis in Vol. II, to agree with the " Geo- 

 graphical Catalogue." 



