DK. PHILIPPICS COMPARATIVE TABLES OF MOLLUSCA. 



rather curious arrangement which I have taken as the most con- 

 venient in making the comparison with fossil species. 



Marine Bivalves 

 Fresh- water ditto 

 Brachiopoda - 

 Pteropoda * - - 



Naked marine Gasteropoda 

 Conchiferous ditto ditto 

 Land and fresh-water ditto 

 Heteropoda - 

 Cephalopoda - 

 Cirrhopoda * - 



British. 



South Italy 



198 



188 



10 



11 



5 



10 



— 



13 



20 



54 



191 



313 



93 



186 



— 



6 



7 



15 



— 



18 



524 



814 



Or, abstracting from the Italian list the groups not given in 

 Fleming, we have 



British. South Italy. 

 Marine mollusca ~ 422 573 



Land and fresh-water ditto - 103 197 



525 



770 



It appears from this result* that South Italy is, as might 

 indeed have been expected, richer in point of species than the 

 British Isles, and that the proportion is nearly 147 to 100. 

 This proportion of course does not hold with respect to separate 

 groups, and the bivalves are actually more numerous in Great 

 Britain than in South Italy. 



The following species are common to Great Britain and 

 South Italy, namely — 



Marine Bivalves. 



Teredo navalis /,. 

 Pholas dactylus L. 

 Candida L. 

 Solen vagina L. 



siliqua L. 



ensis L. 



legumen L. 



coarctatus L. 

 Solecurtus strigilatus L. 

 Panopasa Aldrovandi Men. 

 Lutraria elliptica Lain. 

 Scrobicularia piperata Gm. 

 Mactra solida L. 



stultorum L. ? 

 Bornia seminulum Ph. ? 



(Kellia rubra Flem. ?) 

 Corbula nucleus Lam. 



Pandora obtusa Leach. 

 Osteodesma corrmcans Scac. 



(norvegicum ?) 

 Thracia pubeseens Leach. 

 Gal comma Turtoni Sow. 

 Saxicava arctica L. 

 Yenerupis Irus L. 

 Psammobia vespertina L. 

 costulata Turt. 

 feroensis L. 

 Tellina doiiacina L. 



fabula Gm. 



tenuis Mat. ct Rack. 



fragilis L. 



baltica L. 

 Diplodonta rotundata Mont. 

 Lucina spinifera Mont. 



* It is remarkable that Fleming omits entirely Pteropoda, Cirrhopodaj 

 and the genus Dentalium, and inserts the Pteropod Odontidium rugidostan, 

 describing it as an Orthocera. The addition of the Pteropod makes the 

 complete British list given by Fleming include 525 species. 

 VOL. I. H 



