174 



BALANID.E. 



species existing in European collections, but not hitherto 

 seen by me ; and this, I believe, is a very full allowance. 

 Consequently, even on the supposition that the five species 

 just admitted as possibly existing in cabinets, and that the 

 other five extinct species, which I have seen and examined, 

 have all been previously named by other authors, a supposi- 

 tion excessively improbable, even then there would be 15 

 superfluous names in Bronn. 



The following short table shows how Cirripedes, including 

 all three Families, were represented in Great Britain, 

 throughout the several Tertiary Stages. 



As affording some standard of comparison by which to 

 compare the number of fossil species, at any period, in rela- 

 tion to the number of species probably existing in the 

 neighbouring seas during the same epoch, I may state that 

 there are now living and propagating on the shores of 

 Great Britain, 18 species belonging to the three Families 



