vi] DISTRIBUTION OF SELECTED GROUPS 139 



e.g. Kerguelen (sea-elephants, etc.) and in the 

 Northern Atlantic, Baltic and the whole polar basin. 

 Of special interest is the occurrence of the two monk 

 seals, Monachus tropicalis in the Mexican gulf and 

 M. albiventer from the Canaries into the Eastern 

 Mediterranean. Further, a land-locked seal in the 

 Caspian and another in Lake Baikal, the former 

 identical with our common Phoca vitulina, and the 

 other with the northern ringed seal, P. foetida. 



Lemurs and Monkeys. 



Remains of archaic lemur-like creatures have 

 been found in Patagonian Paleocene, in somewhat 

 later Eocene of North America and in Europe where 

 they extend into the Oligocene. Then they vanish 

 and there is a break between them and the recent 

 lemurs of tropical Africa and Madagascar, with 

 another centre in Malacca and the three great Malay 

 islands ; and with the ancient queer little Tarsius 

 spectrum in Sumatra, Borneo, Celebes and the Philip- 

 pines. 



There is also a complete gap between lemurs and 

 monkeys ; and further a still unbridged gulf between 

 the marmosets and prehensile-tailed monkeys, all of 

 which are tropical American, and the Old World mon- 

 keys which inhabit now the whole of Africa (excluding 

 Madagascar), South Arabia, India to South Japan and 



