non-Marine Mollusca from South Africa. 199 



M. & P.), but equally delicate and remarkable. The chief 

 peculiarity of the shell nov/ before us is, as indicated by the 

 specific name, its sinuous lip. 



Auricula catonis, sp. n. (PI. III. fig. 13.) 



A. testa obloDgo-cylindracea, angusta, nitida, perlaevi, pallide 

 olivacea ; anfractibus (in speciminibus nostris decoUatis) veri- 

 similiter quinque, tribus ultimis apud suturas irregulariter im- 

 pressis, ultimo elongate, recto, cylindriformi ; apertura anguste 

 oblonga, alba, labro exteriore recto, simplici ; columella paullum 

 incrassata, baud nitente, biplicata. 



Long. 9, lat. 4 mm. 



Hab. Cato's Creek, Durban {Burnup). 



The few examples we have seen of this species are 

 uniform.ly decollate, but the whorls would probably be five in 

 number in perfect specimens*. The only two Auriculce com- 

 parable with this and the following species {A. durbanica) 

 are pellucens, Mke., and tornatelliforinis, Pet. To the former 

 we have just referred in the Addenda to our Check-list [vide 

 supra) ; the latter is a larger species altogether, and much 

 more angled at the superior part of the body- whorl. 



Auricula durbanica^ sp. n. (Pi. III. fig. 14.) 



A. testa oblonga, Itevi, paullum nitida, pallide olivacea, apice 

 decollato ; anfractibus verisimiliter 5, apud suturas irregula- 

 riter impressis, Icevibus, vel indistincte longitudinaliter striatulis, 

 ultimo lato ; apertura anguste oblonga ; peristomate tenui, 

 simplici ; columella vix nitente, albida, oblique biplicata. 



Long. 11"50, lat. 5-50 mm. 



Hab. Cato's Creek, Durban [Burnup). 



This species differs from A. catonis^ just described, in its 

 stouter and broader build, the last whorl being decidedly 

 shouldered just below the sutures, and also in its larger size 

 throughout. The spire, too, seems more attenuate, and the 

 aperture, thougli narrow, broader than in A. catonis, espe- 

 cially towards the base. A. tornatelliformis, Petit, with 

 which our species is also comparable, has the base of the 

 aperture broader and rounder and the last whorl more con- 

 spicuously shouldered. The whorls are likewise spirally 

 wrinkled just below the sutures in Petit^s species. 



* The figures of these two Auricula do not show the decollation. 



