194 Messrs. J. C. Melvill crndJ. H. Poiisonby on 



The term Austroci/clus, proposed by Aucey {loc. cit.) to receive Cycloph. 

 Wahlhergi, can only" be regarded as a synonym of Hijahia, Godw.-Aust., 

 published in Jan. 1898, while Ancey's paper is dated June of the same 

 year. 



Page 183. *Neritina crepidularia, Lam. Hist. Nat. Anini. s. Yert. vi. 2, 

 ed. 2, viii. p. 572.— Hab. Natal. 

 This species has been found in Ashanti, but we have not met with it 

 at present from South Africa. 



*Neritina Knorri, Recluz, Rev. Zool. (1841) p. 474, non Reeve, Conch. 

 Icon. pi. ii. sp. 6, = iV^ Beckii, Recluz. 

 Probably a form oi N. pulligera, L., ? found in South Africa. 



2'rachycystis chm-ybdis, Bens. — Thanks to the kindness of the Rev. A. H. 

 Cooke, we have been able to inspect the type of Benson's hitherto un- 

 figured '^ Helix " charybdis ia the Cambridge Museum. It is, unfortunately, 

 a good deal damaged, so we have thought it best to give a figure of a 

 specimen t from our collection, which appears to correspond in everyway 

 with the type, except that the latter is a trifle smaller. Our specimen came 

 from the neighbourhood of Cape Town. 



Emua microthuui)ta\, sp. ii. (PI. III. fig. 1.) 



E. testa minuta, snbperforata, crjstallina, pellucida, uitida, dolioli- 

 formi, apice obtusissimo ; anfraotibus 5|, ventricosis, apud suturas 

 impressis, undiqiie delicate et obscure longitudinaliter arcti- 

 striatis, tribns i;ltimis rectis ; apertura anguste ovata ; peristomate 

 continue, auriformi, dentibus plicisve quatuor munito, videlicet, 

 plica parietali magna, acinaciformi, intrante, dente labiali dupli- 

 cato, partim interne, mamillato, basali parvo, acute ; margine 

 colnmellari incrassato, columella intus valde plicata, plica per- 

 intrante, et aperturam semiclaudente. 



Long. 2, lat. 1 mm. 



Hub. Gialianistovvn {Langley). 



A minute glassy species, of wliich we have seen four 

 examples. Its mouth-processes consist of a large, deep- 

 seated, sharp parietal plait, a double labial tooth, the lower 

 projection of which is mamillate and internal, a small acute 

 basal tooth, and below the thickened columellar margin a 

 very deep-seated extensive plait, halt closing the aperture. 

 We should consider E. Farquhari, M. & P., a near ally of 

 this species, equally minute, similarly subpellucid, and deli- 

 cately longitudinally striate, and also furnished with four 

 mouth-processes, of which the parietal and labial plaits and 

 teeth tire not very dissimilar, the labial tooth being bifid in 

 Loth species ; the columellar margin is, however, much more 

 pronounced in E. microthauma^ almost as much so as in 

 E. lahyrintlua, M. & P. 



t PI. III. figs. 16, 16 a, 16 A. 

 \ fjLiKpos, 6iwfj.a, a little wonder. 



