1893.] SHELLS PEOM BRITISH CENTBAL AITRICA. 635 



7. ACHATINA sp. inc. 



Hah. Augoni-Land {A. Whyte). 



A number of specimens of two species of Achatina occur in the 

 collection ; they are all, however, in too bad a condition for identi- 

 fication. One is very like A. tavaresiana, Morelet, from Angola ; 

 the other is considerably larger and rather lilce the form of Eeeve's 

 figure of A.fulica (Conch. Icon. pi. 2. f. 8). 



8. Ampullaria otata, Olivier. 



Hab. Sumbu, Itawa, S.W. side of Lake Tanganyika (-B.Craiys/ia^/)- 

 This Nilotic species has alreadv been recorded from the lake 

 (P. Z. S. 1880, p. 348). • 



9. Lanistes sOLiDtrs, Smith. 



ffah. Karonga, west shore of Lalce Nyasa (R. Crawshay). 

 One dead specimen. 



10. Lanistes afeinis. Smith. 



Hah. "With the preceding (Cmu'sAa?/); Angoni-Land ( TF7i?/#e). 

 In dead condition from Karonga. The large number of speci- 

 mens from Angoni-Land are aU small or only half -grown. 



11. Lanistes NTAssANcrs, Dohrn. 



Hah. Angoni-Land, south-west end of Lake Nyasa {A. Whyte). 

 The eight specimens of this fine species are all in a worn con- 

 dition and were evidently picked up dead upon the shore. 



12. Laijistes ovum (Peters MS., Troschel). 



Hah. Kabwiri, Lake Mweru {11. Craivslmy). 



This species was originally described from Mozambique, and 

 although quoted from Lake Nyasa I have not yet seen specimens 

 from there myself. 



13. ViVIPARUS TANGANTICENSIS (Smith). 



Hah. Sumbu, Itawa, S.W. end of Lake Tanganyika {R. Craiu- 

 shay). 



Some of the specimens from this locality are remarkably tabu- 

 lated, as in Bourguignat's figure (Ann. Sci. Nat. 1890, vol. x. 

 pi. iii. fig, 1), and the body-whorl is even more strongly keeled at 

 the periphery. The eight so-called species of NeoiJiauma figured 

 by Bourguignat must be regarded as varieties of this variable 

 form. 



The nomenclature of this genus has been fully discussed of late 

 by Mr. Dall\ but his conclusions, to my mind, are open to 

 objection. In the first place, I would point out that Martini was 

 not a binomial author, excepting in occasional or chance instances, 

 and therefore that such chance names as he may have given can- 

 not be accepted. 



1 Trans. Wagner Free Inst. Sci. Philad. 1892, vol, iii. pt. 2, pp. 332-335. 



