Quarterly Journal of ConcJiology. 299 



1 P/iasis, and i Ampdita. JBi/li/uinus is represented by 8 species 

 and Stc/iflgyra by 4. There are 3 Picpi.e of the remarkable sinistral 

 s.g. Faii/a, and 5 of more normal form ; and there is a species of 

 Qcliaxis. The operculale shells are not quite so scarce as in 

 Western Africa ; they number Cyclotus i, Cydophorus 2, Tropi- 

 dophora i, Cydostomus 3, Titdora i, Rcalia i. 



The Lsland of St. Helena can scarcely be referred to any 

 African Region, the reference of the subfossil Bulimus auris- 

 vulpina to Pseiidadiatina being doubtful. 3 Sucdncce are found, 

 f belonging to s.g. Helisiga. i Plelix has been referred to C/iaropa, 

 and 2 to Eudodouta^ both these being Australasian genera, whilst 

 another has been considered to be a Coddostyla. 



Tristan d' Acunha has yielded nothing more than the 2 Bakm 

 mentioned by Woodward. 



5. EAST AFRICAN REGION. Dr. Sclater considers Madagascar 

 as a sub-province, under the name of the Lemurian. If such a 

 division is to be adopted for the Mollusca, ve think it would be 

 advisable to include in it our regions 3, 4 and 5, and characterize 

 it by the abundance of Cydostoinidte, especially TropidopJiora., 

 Cydostomi of similar form, and Otopoma. In the region we are 

 now considering we may define three divisions, rathv^r, however, 

 geograi)hical than zoological — the mainland of East Africa with 

 Zanzibar, the Comores, and Arabia with Socotra. 



A. East Africa. Two species of Trodiomorp/ia, i of Sirep/axis, 



2 oi Ennea, 10 oi Buliiiuiuis., i of Cylindrus, 5 of Adiatifia, 2 of 

 Otopoma, 2 of Tropidop/iora, and i of Cydostomus have been re- 

 corded. One species has been referied \.o Glandina ( G. Boivini) 

 and I to Eledra, but the former being an American and the latter 

 an Indian genus, we consider these identifications as doubtful. 



B. The Comores. These islands have i Jlt/iua, 1 TJiapsia, and 

 2 Eorcasia, besides a few species of the genera also found on the 

 mainland. 



