206 ZOOLOGICAL GEOGRAPHY. [part m. 



The Mediterranean and Atlantic Islands. — The various islands 

 of the Mediterranean are interesting to the student of geo- 

 grapliical distribution as affording a few examples of local species 

 of very restricted range, but as a rule they present us with 

 exactly the same forms as those of the adjacent mainland. ^ 

 Their peculiarities Jo not, therefore, properly come within the 

 scope of this work. The islands of the Atlantic Ocean belong- 

 ing to this suh-region are, from their isolated position and the 

 various problems they suggest, of mucli more interest, and their 

 natural history has been carefully studied. We shall therefore 

 give a short account of their peculiar features. 



Of the three groups of Atlantic islands belonging to this sub- 

 region, the Canaries are nearest to the Continent, some of the 

 islands being only about fifty miles from the coast of Africa. 

 They are, however, separated from the mainland by a very deep 

 channel (more than 5,000 feet), as shown on our general map. 

 The islands extend over a length of 300 miles ; they are very 

 mountainous and wholly volcanic, and the celebrated peak of 

 Teneriffe rises to a height of more than 12,000 feet. The small 

 Madeira group is about 400 miles from the coast of Morocco 

 and 600 from the southern extremity of Portugal ; and there is 

 a depth of more than 12,000 feet between it and the continent. 

 The Azores are nearly 1,000 miles west of Lisbon. They are 

 quite alone in mid-Atlantic, the most westerly islands being 

 nearer Newfoundland than Europe, and are surrounded by ocean 

 depths of from 12,000 to 18,000 feet. It will be convenient to 

 take these islands first in order. 



Azores. — Considering the remoteness of this group from every 

 other land, it is surprising to find as many as fifty-three species 

 of birds inhabiting or visiting the Azores ; and still more to 



^ Malta is interesting as forming a resting-plnce for migratory birds, while 

 crossing the Mediterranean. It has only eight land and three aquatic birds 

 which are permanent residents ; yet no less than 278 species have been 

 recorded by Mr. E. A. Wright as visiting or passing over it, comprising a 

 large proportion of the European migratory birds. The following are the 

 permanent residents : Cerchneis tinnunculus, Strix flammea, Fasser salicicola, 

 Emheriza miliaria, Corvus monedula, Monticola cyanea, Sylvia conspicillata, 

 Colitmba livia, Fiiffinus cinerevs, P. avglorwn, Thalassidrowa pelagica. 



