A, E. Verrili— The Bermuda Islands; Geology. 179 
beach-limestones, they appear to represent beds of the older forma- 
tion that were buried in the later deposits and were afterwards 
removed by solution, leaving the shells and clay behind, as in the 
notable case at Ireland Island described by Lieut. Nelson in 1840, 
His description is quoted above on page 77. 
In the mass of beach rock he found a cavity containing loose red 
earth with an abundance of Pcecilozonites Nelsoni. This occurrence 
seems to me an additional proof that the beach rock at this place 
was much later than the Walsingham limestone, as in the other 
localities described above, pp. 76-78. 
The following list of fossils from the beach deposits is very incom- 
plete, for I did not have time to make so large collections of them 
as I wished, and most other collectors have neglected them, because 
they are nearly all living species. Professor W. N. Rice (op. cit., 
p- 31, 1884) has given a much longer list of fossil shells than any 
other writer. Most of the species named by him were also obtained 
by my party; all those recognized are given in the following lists. 
Many others are too imperfect for identification. 
Crustacea of the Devonshire Formation. 
Balanus (large sp. like B. tintinahulum). 
Fragments of a large barnacle were common in the beach-rocks 
near Hungry Bay. It must have been at least 1.5 to 2 inches in 
diameter. No such species is recorded as now living at Bermuda. 
Cenobita diozgenes (Linn.). Land Hermit Crab. Figure 60. 
The fossil remains of this land crab have been found in a shell of 
Livona pica, It may, however, have been taken from comparatively 
modern sand dunes. It was sent by J. M. Jones many years ago, 
and the exact locality was not recorded on the label. 
Marine Shells of the Devonshire Formation. 
a. Gastropods. 
Purpura hemastoma Linn. 
Near Hungry Bay; fragments. 
Purpura deltoidea Lam. 
Fragments only. 
Nassa ambigua Montagu. Figure 59. 
Not common. Recorded by Rice as V. Candei d’Orb. 
