6 INTRODUCTION. 
I do not believe, if all the specimens of Balani hitherto found in the several tertiary 
formations, from the Eocene to the Glacial deposits, throughout Europe, were collected 
together, they would amount to twenty species. I have myself seen, in a recognisable 
state, only twelve fossil species, of which five are extinct or not found in any neighbouring 
sea: I think it probable that three other recent species, viz., B. tulipiformis, perforatus, 
and amphitrite, may occur in the Mediterranean formations: and this would make fifteen 
species. Therefore, in the above estimate of twenty species, five are allowed for 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 supposition excessively 
improbable, even then there would be fifteen superfluous names in Bronn. 
The following short table shows how the Balanidz and Verrucidze were represented in 
Great Britain, throughout the several Trrtiary Stages. It includes all the sixteen species 
described in the following pages, with the exception of one, the cretaceous Verruca prisca, 
which is the only member of either family hitherto found in any Secondary deposit. 









| — 
| aa Pp n © an 
nn & a: 
| 222 | 88, é 
os n 
See coe my BOE bo © 
aoe a mead o 3 g , 
| Name. Boo aaa, a = o 
| wns = oy $30 S) = g 
| S8sog So xo] g ° 
| 1 n =| op Oo i) o 
33 a a= S cal 
) Qe = oO 
|—_—_______ es 
| Balanus tintinnabulum ; ee of x 
| 
calceolus : E % ns ve oe 
spongicola : : te ig es * 
concavus . . * * *K 
| porcatus . e A * 
| 
| crenatus . 4 * * * 
Hameri * * 2 
bisulcatus : : 60 Ot a ¥ 
dolosus . : ie eo ., 
inclusus . : : Ls af ns eS 
unguiformis : : ne o¢ dee 3 ¥ 
Acasta undulata . ; : 8.0 30 0 es 
| Pyrgoma anglicum : : fy ss a6 * 
Coronula barbara. : : 56 a * 
Verruca Stromia . : ; a eo o ee 
| Total 15, recent and extinct, 
found fossil in Great Britain, 9 4) 8 9 1 
in some tertiary deposit 





