new Mollusca from South Africa. 29 



Whilst in general form allied to D. tucana, Mlill., and 

 others of that section, so typical of the South- African fauna, 

 this extraordinary shell, in the possession of tliree short con- 

 tiguous basal peristomatal teeth, recalls the species of the 

 South-American genus Isomeria. Nothing like this has 

 before occurred in Africa ; and we should have treated the 

 discovery of one specimen alone, exhibiting such peculiarities, 

 as a probable sport or monstrosity^ but three examples 

 occurred. Ooe of these, whose teeth, though very distinct, 

 were not quite so pronounced as those of the example selected 

 for the type, was transversely banded with dark brown round 

 the centre of the last whorl. 



We have considered it desirable to institute a subgeneric 

 name for this new form, and have suggested TulbagJiinia^ 

 from the district where it was found. 



Achatina rhahdota* ^ sp. n. (PI. VIII. fig. 11.) 



A. testa mediocri, ovato-oblonga, tenui, oehraceo-stramiuea, apice 

 obtuse ; anfractibus septcm, supernis decussato-granulosis, ultimo 

 ad medium simili modo granuloso, intra, usque ad basin, Itevi, 

 nitido, undique flammis zebrinis longitudinaliter decoratis, ultimo 

 prolongato ; apertura oblonga ; peristomate tenui, simplici, mar- 

 gine columellari ad basin truncate. 



Long. 45, lat. 20 mm. 



Rah. « South Africa." 



In form resembling A. ustulata, Lam., though not quite 

 so elongate; in marking like a miniature A. zebra, L. It 

 does not seem to be a young shell, and we hardly conjecture 

 that the species will be found to attain greater dimensions 

 than that of the type before us. 



It is handsome, painted with longitudinal close-lying 

 zebrine flames, dark brown on a straw-coloured ground, the 

 whole surface of the upper whorls and the upper portion of 

 the last being delicately decussatedly granulose. 



lOXPLAiNATlON OF PLATE VIII. 



Fig. 1. Natalina caffrida. 

 Fiy. 2. Ennea caryatis. 



Fig, 3. auris leporis. 



Fig. 4. cionis. 



Fig. 5. Crawfordi. 



Fig. 6. Rogersi. 



Fig. 7. Ennea dokimasta. 



Fig. 8. eximia. 



Fig. 9. consobrina, Ancey. 



Fig. 10. Dorcasia (§ Tulbaghinia) 



isomerioides. 

 Fig. 11. Achatina rhabdota. 



pd^8(OTos, zebra-striped. 



