952 PROFESSOR J. PRESTWICK OK THE EVIDENCES OF A SUBMERGENCE 
The Raised-Becwh Shells of Sardinia. 
Cerithium vulgatum, Bn. 
Conus Mediterraneus, Brug. 
Murex plicatus, Brog. 
,, SedgimcJcii, M. 
,, trunculus, L. 
'^Hassa reticidata, F. 
Area Now, L. 
*Cardiuni edide, L. 
,, papillosum, Poli. 
„ rusticum, L. 
,, tuherculatum, L. 
Donax truncidus, L. 
Lucina fragilis, Ph, 
,, lactea, Lk. 
Lutraria rugosa. 
^Moxtra stidtorum, L. 
*Mytilus edulis, L. 
*Ostrea edulis, L. 
,, lamellosa, Broc. 
,, plicatula, L. 
Patella Lamarchii, Lk. 
„ scutellaris, Lk. 
Tritonum nodiferum, Lk. 
Turbo rugosus, L. 
Vermelia triquetra, L. 
'^Pectunculus glycimeris, L, 
,, p>ilosus, Lk. 
Petricola fragilis, L. 
,, lithophaga, Betz. 
Pinna rudis, L. 
,, tetragona, Broc. 
*Scrohicula piperata. 
Solen vagina, Lk. 
Spondylus gardrop>us, L. 
Tellina p)lanata, L. 
Venus chione, L. 
„ decussata. 
,, gallina, L. 
multilamella, Lk. 
,, verrucosa, L. 
Those with a star are found also in the glacial deposits of England. 
In some cases the shells are whole and with both valves united, but more generally 
they are broken, and with the colour often preserved as in the Channel beaches. 
Ostrea and Mytilus sometimes form entire beds. On the coast the beach is generally 
about 20 feet above the sea-level, though sometimes less, and is of small thickness, 
but it is said that as it extends inland it increases in height and thickness, attaining 
at Fontana, one mile from the sea, a height of 90 feet, and at Marmorata, two miles 
inland,, a thickness of 60 feet, whilst at Alghero it is said to rise to a height of 
100 metres.! At one place the so-called beach was found three miles inland. This 
deposit is, as at Gibraltar, generally consolidated by a calcareous cement, and has been 
quarried as a building stone from time immemorial. The beds are generally nearly 
horizontal, and sometimes show oblique lamination. 
On the summit of the hill of Monreale, near Cagliari, there are fissures (a", fig. 18), 
filled with breccia containing an enormous quantity of bones of Lagomys, Myoxus, 
Arvicola, and other small animals, but without any of the larger extinct Mammalia. 
t I should iuiagine these to be uot one but separate sea-levels, like those of Gibraltar. 
