6 Melvill & STANDEN, Mollusca from N.E. Rhodesia. 

 Fam. Ampullariid^e. 



Lanistes affinis Smith. 



Lanistes affinis, E. A. Smith, P roc. Zool. Soc. Lond., 1877, 

 p. 716, pi. 74, fig. 7. 



Lanistes ovum Pet. var. affinis, E. A. Smith ; E. von Martens 

 " Beschalte Weichthiere Deutsch-ost-Afrikas," p. 166. 



Hab. Mterize River, Loangwa, July, 1905, and 

 Zambesi River. 



Seems to us a distinct species. Some fine examples 

 from Nyasa are in the British Museum. Mr. Neave's 

 examples are characteristic, but small. 



Lanistes neavei sp. n. (Figs. 1 and 3 of Plate). 



L. testa sinistrorsa, ovato-rotunda, solidula, profunde 

 umbilicata, albo-cinerea, spiraliter arete multi-zonulata, 

 zonulis variis, ssepe apud basin anfractus ultimi evanidis, 

 anfractibus 5, ad suturas multum impressis, infra suturas 

 paullum planulatis, deinde ventricosis, lineis incrementa- 

 libus arctis longitudinaliter in speciminibus adultis, praeci- 

 pue ad anfractum ultimum, fortiter praeditis, apertura 

 fere rotunda intus, ut extus, zonulata, zonulis ultra 

 marginem interiorem evanidis, peristomate paullum in- 

 crassato, albo, nitido, continuo, margine columellari 

 obliquato. 



Alt. 20. Diam. 25 mm. spec. maj. 



Hab. Kapopo, Oct. 26th, 1905. 



A considerable number of examples, mostly somewhat 

 immature. These latter are smoother and more shining, 

 clearly exhibiting the characteristic spiral brown-zoned 

 marking, especially on the body whorl. Two examples 

 of a variety occurred in which these zones are entirely 

 absent, these might be designated as var. unicolor (Fig. 3). 

 It gives us much pleasure to connect with this interesting 



