Quarterly J our rial of Ccuchology. 373 



Die geographische Verbreitung CiQ.v Mollusken. — 

 By W. Koeelt. 



The admirable papers compiled by Dr. Kobelt on the terres- 

 trial and fluviatile molluscan fauna of different regions are founded 

 on the researches of the latest authorities. The prefatory remarks 

 give the authorities for the different regions and the author's views 

 on the peculiarities of distribution, (S:c. 



In the first part, which is devoted mainly to the Atlantic 

 Islands, the faunae of the Azores, Madeira, Canaries, Cape Verde, 

 Prince's Island, St. Thomas, Fernando Po, St. Helena, and South 

 Morocco, the chief feature of which is their large number of 

 endemic species, the total number of species being for the Azores 69 

 of which 33 are special forms, the most interesting feature being 

 the Vitrintd and Craspedopoiiia. 



Madeira, which has a fauna far more specialized than the 

 x\zores, contains 161 species, of which 133 are peculiar or found 

 nowhere else, the characteristic groups are Leptaxis, Ochtephila^ 

 Tcdula, Cionella, Craspedopoma^ &:c. 



The Canaries partake in common with the Madeiras of a 

 marked special development of species; in a total list of 193 

 species, 167 are found only on those Islands, the predominant 

 groups being Heinicycla, PleciopJiorus, and Buliuiiuus. 



The Cape Verdes produce a very meagre list having but 39 

 species, 27 being peculiar; Leptaxis is the prevaling genus. 



Prince's Island contains 2 7 species of which 2 1 are peculiar. 

 Here we find indications of more eastern affinities in the two 

 species of Auvu'iia, the Aciia/iiia, Eunea, Szc. 



St. Thomas Island has 10 species, 8 of which are peculiar, 

 JVauiua being the prevailing genus. 



Fernando Po has only 4 species of which two are Achatince. 



