CAPE UEGION. 



391 



S. putris, and two European Helices (H. cellaria and pulchella) probably 

 imported to the environs of the Cape. There are also 3 slugs, 9 freshwater 

 Pulmonifera, 7 marine Pulmonifera, 5 freshwater bivalves and 5 univalves. 

 The species found at the Cape, Algoa Bay, Natal, &c., are for the most part 

 different — Potamides decoUatus, ClioneUa simiaia and an Assiminea inhabit 

 brackish waters. 



Limax 1 



Arion 1 



V'itrijia 4 



Helix 29 



Succinea 4 



Bulimus 9 



Pupa 6 



Achatina 5 



Cyclostoma 



Limnsea 1 



Physa 4 



Physopsis 1 



Ancylus 1 



Planorbis 3 



Vagiuulus ] 



Oucidium 1 



Auricula 6 



5. Yemen — Madagascar. 



The S. "W. Highlands of Arabia (Yemen) form a distinct Botanical pro- 

 vince isolated by rainless deserts to the north. The land snails consist of a 

 few species of Helix and Bulimns, Cydosioma Uthidion, and 3 species of the 

 section Otopoma, a group also found in Madagascar. Two species are com- 

 mon to the island of Socotra, (No. 80) which also has a species (of Pupa) 

 common to Madagascar. Bulimus guiUaini, Cyclostoma gratum, modestum 

 and Souleyeti are found on the island of Abd-el-Gouri. 



Very few land shells have been collected on the maiuland of Eastern 

 Africa, although it is a rainy region, and well wooded in the southern part: 

 3 species only are recorded from JNIogadoxa and Ibu, belonging to the genera 

 Helix, Bulimulus, Achatina, Pupa, and Otopoma. On the Island of Zan- 

 zibar are found, Achatina Uodatxi, and allisa, Cyclostoma CrepHni, and 

 Zanguebarica ; Pupa cerea is common to Zanzibar and Madagascar. 



Madagascar itself is rich in land shells ; Dr. Pfeiffer enumerates— //g-Zir 

 28 sf., Bulimus 6, Succinea 14, Pupa \, Achatina 4, (one of \vhich, 

 exim.ia, is allied to A. Columna, of W. Africa), and 32 Cyclostomidse, chiefly 

 of the section vnth spiral ridges {Tropidophnra), 3 of the division Otopoma. 

 Cyclostoma cariniferum and Cuvieri are found on the Island of Nosse 

 Be; Helix guiUaini on S. Maria I. Amongst the fresh-water shells are 

 Melania amarula, Melanairia flaminea and Neritina corona. 



The land shells of the Mascarene Islands are all peculiar; we are indebted 

 to Mr. W. H. Benson for most of the information existing in respect to 

 them. 



Comoro Islands. 

 Helix russeola and Achatina simpidaria are found in Mayotte : Cyclostoma 

 in Mayotte and Madagascar. 



