108 



LUSITANIAN PROVINCE. 



species of mollusks of decidedly Mediterranean 

 types, and which do not range to the Celtic seas. 

 A peculiar Littorina, Chiton cajetanus, Pleurotoma 

 Maravignw, and Pollicipes cornucopia, may serve as 

 striking examples. Vigo Bay is a great arm or 

 lough of the sea running inland in a mountainous 

 country. It is 16 or 18 miles in length, and as 

 deep as 25 fathoms in the mid-channel, with a 

 muddy bottom. Its most striking zoological fea- 

 ture is the significant circumstance discovered by 

 Mr. Mac Andrew, that instead of its fauna being 

 characteristically of a Mediterranean, or rather 

 Lusitanian character, as might be expected by its 

 position, and by the nature of the marine fauna of 

 the Spanish coast to the north and to the south of 

 it, we find the assemblage of animals and plants 

 inhabiting this fiord, to use the Norwegian term, 

 mainly of a Celtic or British character. Its littoral 

 or coast-line animals are especially of British types. 

 Out of 200 species of testacea taken there, only 25 

 are forms which do not occur in the British seas. 

 Some of these are, however, remarkable, and serve 

 strikingly to indicate the difference between the 

 Celtic and Lusitanian areas, such as Tellina serrata, 

 two species of the beautiful genus Solarium, Tro- 

 chus Laugieri, Ringicula auriculata, and two species 

 of Triton, including the great Triton variegatum, 

 or Trumpet whelk. About 28, on the other hand, 

 are species which do not range to the Mediterra- 

 nean. Some of them are characteristically northern 



