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



vel plica altera margincm ad medium columellarcm, altera 

 basaliter,tertia (in una specie) plica crassiuscula, extensa, interna, 

 pone labium contra aperturam extensa. 



Afrodonta hilamellaris, sp. n. (PL VII. fig". 6.) 



A. testa uti supra, conioo-depressa, tenni, cornea, profunde umbili- 

 cata, microscopice longitudinaliter striatula ; anfractibus 5, 

 vcntricosulis, angustis ; apertura lunari, peristomate tenui, bi- 

 lamellata, lamella vel plica altera margiuem apud columellarem 

 in medio valde intrautem, altera basali, conspicua, dentiformi. 



Alt. 0-84, diam. 1-48 mm. 



Bab. Dargle, Natal; Edendale Falls, June 29, 1907 

 {H. G. Burnuj)). 



Afrodonta trilamellaris, sp. n. (PL VII. figs. 7, 7 a, 7 b.) 



A. testa charact. uti supra, minuta, cornea, late umbilicata, plan- 

 orbula ; anfractibus 4|, ventricosulis, undique microscopice longi- 

 tudinaliter tenuistriatis ; apertura lunari; peristomate tenui, tribus 

 lamellis plicisve prtedito, altera obscura ad basin, interdum 

 iucrassata, extensa, interdum dentiformi, altera collumellarem 

 apud marginem medium, louge intrante, tertia interna, iucrassata, 

 contra aperturam extensa. 



Alt. 0-80, diam. 1-39 mm. 



Bab. Dargle, Natal, January 1907 (B. C. Burnup). 



Two of the most noteworthy discoveries in the South- 

 African mollupcan fauna made during recent years, and 

 both due to Mr. Burnup, who is much, on this account, to be 

 congratulated. Both species are, conchologically, very nearly 

 allied, differing only slightly in form and arrangement of 

 wliorl. The chief distinction lies in the second species 

 described possessing an extra lamella or peristomatal appen- 

 dage, internal, extending a little distance behind the outer 

 lip, while the basal tooth-like plait is not always distinct (as 

 seems to be the case in A. bilamellaris) , though Mr. Burnup, 

 who has examined many specimens, is convinced the three 

 lamellae are always present, though not always equally 

 developed in individual specimens. 



As already mentioned in our prefatory remarks, the new 

 genus it has been considered necessary to establish will find 

 a place among the Endodontids, a family of Helicoids abun- 

 dant in many parts of the world, but hitherto not known to 

 occur in South Africa, excepting in the form of the some- 

 what solid xercophilous PAasz's, Menke, to which the delicate, 

 horny, simple-mouthed Trachi/ci/sti's, Pilsbry, is at present 

 considered subgeneric *. We may mention that we recently 

 * Man. Couch, ix. p. 37, 



