SOUTHERN EUROPE. 



SHELLS. 



41 



M. trunculm (fig. 9-), Byssoarca Noce Sw., Isocardia 

 Cor; and many other smaller species, which woxild 

 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, Cyprcea mus, Chama gryphoides, Oliva 

 (one species). Con us Virgo, C. monachus, and probably 

 several other shells ; the above being inserted in the 

 list of Ulysses.* 



(56.) The fluvlatile 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 of 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 lit (oralis {fig. 10. a), the U. 

 batava (h), and the Unio intermedins (c, c); the latter 

 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 in the Kingdom of Naplee, 8vo. London, 1793. 



