970 CAPT. STANLEY S. FLOWER ON THE [Dec. 18, 



VII. MOLLUSCS. 



Thanks to the kind assistance of Mr. Edgar A. Smith, I have 

 been able to identify at the British Museum most of the shells 

 collected on the White ZS'ile : they are referable to eleven species. 



Family YivipabldjE. 



1. Vivipaba unicoloe Olivier. 

 One specimen from Abu Zeit. 



Family StenogybiDjE. 



2. LlMICOLABIA CAILLAUDI Pfr. 



Many specimens of this beautifully marked tall spiral shell were 

 picked up at Fashoda, and a few at other places between there and 

 Jebel Ain. 



Family Ampullaeiid.e. 



3. Ampullaeia weeneei Philippi. 



Shells of this species were very numerous, scattered about the 

 banks of the White Nile at Abu Zeit, Fashoda, &c, and also along 

 the Bahr-el-Zeraf and Bahr-el-Ghazal. This species attains to a 

 large)- size in this region than any African freshwater shell 

 was previously known to ; I have measured a specimen nearly 

 5 inches (125 mm.) across in its largest diagonal diameter. 



4. Lanistes pcbpueetjs Jonas. 



This sinistral shell we found numerous along the Bahr-el- 

 Zeraf. 



5. Lanistes caeinatus (Olivier). 



Of this sinistral shell we obtained specimens at Fashoda and 

 other places on the "White Nile, and also on the Bahr-el-Zeraf. 



Family Cyeenid.e. 



6. C'OEBICDLA ELUMINALIS Mull, jr. 



One specimen from Abu Zeit; both Sir Samuel Baker and 

 Consul Petherick also obtained examples of this species from the 

 White Nile waters. 



Family UmasiDM. 



7. Unio tebetiusculus Philippi. 

 This small Mussel we got at Abu Zeit. 



Family Ieldinlb^e. 



8. MUTELA BOSTEATA Bang. 



A very elongated Mussel from the White Nile, south of Abu 

 Zeit. 



