CASE OF AFFINITY BETWEEN ANIMALS, 417 
far as the tropic of Capricorn, and Sciurine cover the whole of 
Europe, North Africa, and the continent of Asia, the Nanno- 
sciurine being in the Old World rigidly restricted to a small 
part of West Africa and to the Malay Archipelago. The addition 
of Guiana to the known distribution of the group is therefore of 
extraordinary interest. 
Here, if ever, there would seem to be a case supporting the 
persistence of the now generally admitted * transatlantic con- 
nection into mammalian times, but bearing in mind how other 
cases—such as those of the Tapirs and Opossums—have become 
weakened by the discovery of fossil members of the groups in 
N. America, Europe, and N. Asia, it would be wise not to lay too 
much stress upon it, isolated and absolutely tropical as are the 
three genera of Nannosciurine. 
Moreover, the fact that in every character which separates the 
other two, the Guianan Sciurillus agrees with the Malay Nanno- 
sciurus and not with the African MZyosciurus, is also against this 
ease having any connection with the ancient ‘“‘Gondwana-land,” 
which at a time almost or quite pre-mammalian is supposed to 
have extended from Eastern 8. America across Africa into the 
Malay region. 
* Cf. Andrews, ‘Tertiary Vertebrata of the Fayum,’ Introduction, p. xxvi (1906). 
