SOUTHERN EUROPE. — SHELLS. 41° 
M. trunculus ( fig.9.), Byssoarca Noe Sw., Isocardia 
Cor; and many other smaller species, which would 
deserve a place in cabinets. It is also remarkable that, 
in these seas, the first indications of the conchology 
of the Asiatic region are found in such shells as Car- 
dium cardissa, Cyprea mus, Chama gryphoides, Oliva 
(one species), Conus Virgo, C. monachus, and probably 
several other shells; the above being inserted in the 
list of Ulysses.* 
(56.) The fiuviatile shells of Europe are chiefly 
confined to its central latitudes. Those little sheltered 
streams, pools, and brooks, which are so abundant in 
this island, and which appear so congenial to these ani- 
mals, are very rarely seen in the warm countries of the 
Mediterranean, where the fervour cf a summer sun 
would soon render them dry. In the deeper rivers 
however, of France and of Italy, some species of Unio, 
or freshwater muscle, are found, which we do not pos- 
sess. These are the Unio littoralis (fig. 10. a), the U. 
batava (b), and the Unio intermedius (c, c); the Jatter 
being a new species sent to us from Gibraltar. The 
land shells, on the other hand, are more numerous in 
Italy than in England ; and in certain situations, where 
the surface is rocky, several species are found in the 
‘ 
* Travels inthe Kingdom of Naples, 8vo. London, 1795. 
