40 



want of fleckplato, in the female, of the exterior l)ranch of 

 the first pair of pleopodes, being reduced to a little oval 

 trachea. In the male the deckplate of this pair of legs is 

 scarcely completely wanting anywhere, but is very variable 

 in the different species. When I have not l)een able to give 

 notice with regard to this relation, it is because that wliilst 

 I have had female specimens of almost all the species I 

 have examined, I have but of the fewest of the species had 

 male specimens, it seems they are obviously in a very 

 smaller number. 



My systematic division is corroborated by the geographi- 

 cal distribution of the forms. The species of Armadillo are 

 almost exclusively habitants of Europe, Asia Minor, Africa, 

 America; the species of the genus Spherillo and of the other 

 allied genera are living in Australia and spread to all the 

 numberless isles of the Pacific Ocean, also in the Southeast 

 Asia and the East India Archipelago; these last countries 

 and the eastern coast of Madagascar are the meetingplace 

 for forms of both genera. With regard to the terre- 

 strial Isopods the largest part of Europe and North Africa 

 is well worked out, with the greater portion of the other 

 continents the researches are sparing and wide spread. From 

 the interior of Africa, the largest part of South Asia and 

 New Holland are but very few species brought to the light, 

 and just from these last parts of the earth should species, 

 l)elonging to the group here treated, be expected. The dis- 

 persion of the species of Spherillonince from Japan towards 

 South over the Philippine Islands, the Sunda Islands, New 

 Guinea, New Holland to Van Diemensland and from here 

 towards East over New Zealand and all the Pacific Islands 

 to points in the west-coast of South-America can point to 

 the outlines of a former continent: the east-coast of Mada- 

 gascar, however, together with the little Islands Seychelle 

 and Mauritius and also the Malayan Peninsula, although 

 lying out of this boundary must certainly belong to it. 

 One point only seems a little without connexion, Siam 

 and Mt. Karen in Burma, this however could give rea- 



