408 PROCEEDINGS OF THE ACADEMY OF [April. 
The shells at these places are so perfectly preserved that even the term 
“semi-fossil”? seems a misnomer for them. Probably the sand pre- 
serves them by saturating the water with lime before it reaches them. 
One of these shell deposits, locality No. 818, on the land of Mr. Benja- 
min Trott, in Tucker’s Town, is only from 8 to 36 inches below the 
surface. The P. nelsoni were mostly in the upper foot of the deposit, 
where the bank is thoroughly solidified by the rain; but a few inches 
lower the sand is still loose enough to be scraped out with a strong hoe. 
The two localities last to be mentioned, Nos. 808 and 809, are essen- 
tially alike. They face the Devonshire marshes on the northwest 
side—808 near the north end and 809 close to the barracks. The sand 
in these dunes appears to have drifted from near the present line of 
the north shore—a consideration which may yet give a clue to their 
age. | 
The following are my records of fossil and semi-fossil shells in these 
localities : 
Locality 807. 
PCILOZONITES NELSONI. 
% NELSONI CALLOSUS. : 
cc } 
CIRCUMFIRMATUS 
. ; Intergraded. 
DISCREPANS. 
EUCONULUS TURBINATUS. 
ZONITOIDES MINUSCULUS. 
“ BRISTOLI. One specimen. 
THYSANOPHORA HYPOLEPTA. 
SUCCINEA BERMUDENSIS. 
VERTIGO NUMELLATA. 
a MARKI? 
CARYCHIUM BERMUDENSE. 
Casts in the Rock, Locality 806. 
P@CILOZONITES CIRCUMFIRMATUS. 
VERTIGO. 
CARYCHIUM? 
Cave and Pockets, Locality 806. 
PCILOZONITES NELSONI. Both extremes in height of spire. 
ff BERMUDENSIS ZONATUS. 
" REINIANUS. 
e CIRCUMFIRMATUS. 
