— Jess =: 
era. 
s. 
Wa 
if 
ASOEIC OF CAPRICORN 
| 
600 800 “1000 Miles 
tte 
200 0. 600 800 cori 
10 Meridian 0 of Greenwich. 10 20 30 ‘ 40 5) 60 
Map 12. Malacological main divisions of the Ethiopian Region. 
I. West African Subregion. The limits of the continuous rain forest belt are indicated by an 
interrupted line. 
II. East African Subregion. 
IIa. Sudanese Province. 
IIb. Northeast African Province. 
IIc. East African Province. ‘ 
III. South African Subregion. | 
IV. Malagasy Subregion or Region. 
The appearance of endemicity of the West African Subregion is 
further increased if we take account of its special subgenera of genera 
having a wider range, such as Bocageia, Gulella, and others. Moreover, it 
is significant that this subregion has less in common with the Oriental 
Region than any other part of the Ethiopian Region. The large number . 
of special genera evolved there gives support to Chapin’s belief that the 
‘humid area near the equator is of vast antiquity.”’ 
2. East Arrican SuBRrEGIoN.—The number of genera special to 
this subregion is much smaller than in the West or the South African 
Subregions, largely for the reason that the greater number of its genera 
range into the limits of one or both of the others. It is especially rich in 
genera related to those of the Oriental Region. | 
