Manchester Memoirs, Vol. li. (1907), No. 4. II 



Burtoa nilotica (Pfeiffer). 

 Bulimus niloticus Pfeiffer, Proc. Zool. Soc. lond., 1861, p. 24; 



Mai. Bldtt., vol. 8, p. 14, 1862. 

 Limicolaria nilotica Pfr., " Novitat. Conch.," vol. 4, p. 5, figs. 



1 — 3. (var. Schweinfurthii inclusa.) 

 Achatina nilotica von Martens, Mai. Bldtt., 1870, p. 22. 

 Burtoa nilotica Brgt, "Moll. Afrique equat.," p, 89, March, 



1899. 

 Livinhacia nilotica Crosse., Journ. de Conch., 1889, p. 109. 

 Lirinhacia arnoldi Sturany, " Siidafrik. Mollusken," p. 59, 1898. 

 Hab. Petauke. 



Many varieties of this large and imposing mollusc 

 are described and figured by various authors, notably von 

 Martens* and Bourguignat. The latter, indeed, has 

 unduly created a new genus (Burtopsis), besides several 

 so called species, all formed out of the B. nilotica, and the 

 remarks of Mr. Edgar Smith,"f* in reference to this subject, 

 may be read with profitable interest. 



The distribution is wide, extending over a very large 

 area both North and South of the Victoria Nyanza, where 

 seem to be its head-quarters. 



Achatina craveni Smith. 

 Achatina kirkii E. A. Smith, Ann. Mag. Nat. Hist., (5), vol. 6, 

 p. 428, 1880, non A. kirkii (Psendoglessula kirkii), 

 Craven (1880). 

 Achatina cravenii E. A. Smith, Proc. Zool. Soc. Lond., 1881, 

 P- 283. pl- Zh fig- 1 1 ; Op. cit., 1899, p. 590, pi. 35, fig. 1, 2. 

 Hab. Petauke, and its immediate neighbourhood, up 

 to 2,400 feet. 



A very handsome, but variable species, of fairly wide 

 distribution, abounding in the Tanganyika, M'bvva, and 

 Massai Countries, also in Nyasaland, and not unknown 

 at Zanzibar. 



Several examples in various stages of growth. 



* " Ost Afrika," pp. 94—98. 

 t Proc. Mat. Soc. Lond., vol. 1, p. 324. 



