THE EUROPEAN SEAS. 



241 



impression, on examining the Testacea of the Gulf 

 of Genoa, was, that the fauna of the Mediterranean 

 was mixed, and not peculiar to that sea. I found 

 a large proportion of species which were familiar to 

 me as British, and others having a more southern, 

 and even tropical habitat. This led me to inquire 

 whether the division into certain definite areas, 

 which the ]ate Professor Forbes distinguished by the 

 names of Boreal, Celtic, Lusitanian, and Mediter- 

 ranean, was well founded." 



Testing these several divisions, or types, by the 

 results of his own Mediterranean researches, Mr. 

 Jeffreys states, that of the species supposed to be 

 peculiarly " Boreal," he found several in the Gulf 

 of Genoa, " such as Chiton Hanleyi, Mangelia bra- 

 chystoma and Newra costellata. Another (Mangelia 

 Leufroyi, or Boothii) has been described and figured 

 by Philippi as a recent Sicilian species, and a fifth, 

 Scissurella crispata, I believe to be identical with 

 the 8. decussata of D'Orbigny. 



" Of the second division, or ' Celtic ' species," 

 continues Mr. Jeffreys, " I met with Tapes pallus- 

 tra (of which the Venus geographica of continental 

 authors is a variety), Acmwa virginea, Lucina bore- 

 alis, and L. flexuosa. Philippi has given Trochus 

 millegranus ' and Eidimella M l Andrei [Melania 

 scillas), as Sicilian species. Of the third division, 

 or ' peculiarly British ' species, several, as Jeffrey sia 

 diaphana, and the so-called Skenice, besides Argiope 

 cistellula (Orthis Neapolitana, Scac), also occurred 



