636 Messrs. J. C. Melvill and J. H. Ponsonby on 



are they. The extremely delicate strire are so indistinct as to 

 be hardly discernible ; but they give a silky appearance to 

 the surface. The mouth is linear ; peristome thin, simple. 

 Four specimens. 



Achatina Livingstonei ^ sp. n. (PI. XVII. fig. 6.) 



A. testa angusta, fusiformi, tcnui, straminea, la;vi, apice obtuso ; 

 anfractibiis septem, apiid sutnras paullura impressis, ventricosulis, 

 ultimo ceteris longitudine superante, longitudinaUter ilammis 

 zebrinis castaneis decorata, flammis hie rectis, illic ramosis vel 

 divaricatis; apertura ovata, labri margine exteriore tenui, colu- 

 mellari versus basin truncate. 



Long. 41, lat. 20 mm. 



Hah. Kuruman, Bechuanaland [David Livingstone : in 

 coll. E. L. Layard). 



Shell somewhat narrow, fusiform, thin, smooth, apex 

 obtuse; whorls seven, somewhat ventricose, impressed at the 

 sutures, straw-coloured, and ornamented with chestnut zebrine 

 longitudinal markings ; these are in some instances straight, 

 in others branched and almost divaricate ; the last whorl 

 exceeds all the others collectively ; the moutii is rather nar- 

 rowly ovate, outer lip thin ; columellar margin truncate 

 towards the base. 



Allied to A. Pfeifferi^ Dunker, and A.polychroa, Morelet. 



We are glad of the opportunity afforded us, through the 

 kindness of Mr. Layard in lending this most interesting 

 shell to describe, of associating with it the name of the illus- 

 trious pioneer of missionary enterprise in Tropical Africa, the 

 late Dr. Livingstone, by whom it was discovered. 



Achatina drakenshergensis^ sp. n. (PI. XVII. fig. 7.) 



A. testa magna, fusiformi, delicata, nitida, apice obtuso ; anfracti- 

 bus octo, ad suturas impressis, ventricosidis, albidis ; epidcrmide 

 luteo-obvacea omnino contecta, apicalibus exceptis, interdum 

 fere htvibus, fiammis zebrinis brunneo-castaneis dej»i<'tis, ultimo 

 anl'ractu simili niodo superne apud medium, sed a medio usque ad 

 basin immaculato, interdum anfractilais minute graiudatis, Hammis 

 zebrinis fere absentibus, hie illic vittis vel tlaramulis interruptis 

 solum designat is, ultimo an fractu infra medium similiter immacu- 

 lato ; apertura oblouga intus carulescenle, labro extus tenui, 

 margine columellari sinuoso, conspicue apud basin truncate. 



Long. 3-25, lat. 1'75 unc. 



Hah. Inhluzan, Drakensberg range, Natal. 

 A highly interesting form, two varieties of whicli are before 

 us. The shell is fusiform, with ventricose whorls, somewhat 



