GEOGRAPHICAL RANGE. 165 



Had I included the West Indies* in ray first province, the 

 total number of species would have been 42, of which 

 28 would have been peculiar. The coast of Brazil, even as 

 far south as the Rio Plata, might, also, have been included, 

 for I have not seen from it a single species not included in 

 the above 42 West Indian species. So also, by adding a 

 single species, might' the west coast of equatorial Africa. 

 The two coasts of South America and Africa, which face 

 each other within the torrid zone, seem to be remarkably 

 barren in Cirripedes. Europe has several more species 

 than the United States, which is inhabited by only ten 

 species, including even the probably imported Balanus tin- 

 tinnabulum and amphitrite. Of these ten United States 

 species only two are not found in Europe ; and both these 

 two range into the West Indies, and as far as the northern 

 shores of South America, and therefore cannot be con- 

 sidered as peculiar to the United States. 



I have formed my single sub- province for the southern 

 extremity of Africa ; for although I know of only 1 1 species 

 from this comparatively short and uniform line of coast, 

 yet I was not able to group these eleven in any of the main 

 provinces : 5 of the species are peculiar, 1 Australian, 

 3 European and West Indian, and 2 almost universally 

 distributed. 



The second province includes the west coast of North and 

 South America, from Tierra del Fuego to Behring's Straits : 

 on this enormously long line of coast, only 22 species are 

 known to exist, but of these no less than 1 5 are peculiar. 

 Of these 15, four are not found south of the torrid equa- 

 torial region, and eight are not known to occur north of 

 this same region ; so that this long line of coast might have 

 been divided into two sub-provinces, of which the southern 

 would have been the most peculiar ; but as eight species 

 are found both north and south of the equatorial region, 

 I have not made this sub-division. Two of the species 

 occurring on the western coast of North America, seem to 



* The total number of species which I have seen from the West Indies, is 

 19 or 20 ; of these, only 6 are peculiar to it, or 8, if the United States be like- 

 wise included, the other 12 or 14 species being found in other quarters of the 

 world. Six peculiar species out of 19 or 20, has not appeared to me sufficient 

 to institute even a sub-province. 



