124 Mr. E. A. Smith on the Shells of the 



Martens only had young specimens under examination, and 

 it seems to me possible that they may be referable to the 

 following species, as he mentions their possessing two distinct 

 keels. V. capillaius has an angle at the periphery and a 

 shouldering above, but it cannot be described as carinate. 



8. Viviparus victorice. (PL XII. figs. 8-10.) 

 Paludina, sp. n., Smith, Ann. & Mag. Nat. Hist. August 1890, p. 149. 



Testa aimbilicata, conica, mediocriter tenuis, epidermido olivacea 

 nitida induta, ad apicem plus minus erosa, purpurea ; anfractus 

 6, convexiusculi, inferne ad suturam carinati, interdum paulo 

 supra medium leviter carinati vol angulati, lineis incrementi 

 obliquis flexuosis, striisque spiralibus tenuissimis seulpti, ultimus 

 circa medium carinatus, plerumque ad aperturam leviter infra 

 carinam descendens ; apertura subcircularis, longit. totius | ad- 

 sequans, intus submargaritacea ; perist. ad marginem nigresceus, 

 latere columellari leviter incrassato. 



Longit. 33 millim., diam. 20 ; apertura 14 longa, 12| lata. 



Var. a. Testa vix umbilicata, anfractu ultimo fortiter et acute 

 carinato, carina supra spiram pagodiformem continua. 



Var. 6. Testa minor, vix perforata, solidior, carinis fere obsoletis, 

 anfractibus magis rotundatis, epidermide magis strigata. 



I have set aside certain specimens as varieties a and h 

 chiefly to call attention to the great variability of this species. 

 At first sight it seems hardly credible that the var. b can 

 belong to the same species as the type. However, the series 

 of specimens in the Museum apparently proves them to be so. 

 The strength of the carination, the size of the umbilicus, and 

 the size of the shells themselves are very variable ; but even 

 in specimens which are least keeled traces of the keels are 

 noticeable. The slight angulation near and a little above the 

 middle of the whorls of the spire is more distinct in some 

 specimens than others, and the spiral sculpture is also distinct 

 in some instances, feeble in others. 



In the var. a the strong keel of the body-whorl revolves 

 up the spire a little above the suture, so that the spire presents 

 a pagodiform appearance. In these specimens also the termi- 

 nation of the keel modifies the form of the aperture, producing 

 a slight angle in the middle of the outer lip. 



9. Viviparus Jucundus. (PI. XII. fig. 6.) 



Testa parva, imperforata, ovato-turrita, haud nitida, epidermide 

 tenui olivacea induta, ad apicem erosa ; anfractus 5, convexiusculi, 

 sutura profunda sejuncti, lineis incrementi obliquis conspicuis. 



