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Show 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 Nile : they are referable to eleven species. Family VIVIPARIDJE. 1. VIVIPARA UNICOLOR Olivier. One specimen from Abu Zeit. Family STENOGYRiDiE. 2. LlMICOLARIA 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 AMPULLARIID^E. 3. AMPULLARIA WERNERI 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 larger 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 PURPUREUS Jonas. This sinistral shell we found numerous along the Bahr-el- Zeraf. 5. LANISTES CARINATUS (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 CYRENID^E. 6. CORBICULA FLUMINALIS Miill. 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 UNIONID^E. 7. U N I O TERETIUSCULUS Philippi. This small Mussel we got at Abu Zeit. Family IRIDINID^E. 8. MUTELA ROSTRATA Eang. A very elongated Mussel from the White Nile, south of Abu Zeit. |