SOWERBY : OX AMPULLAKIIDiE. 361 



suturam depressus ; apertura ovalis ; peristoma tenue. Long. 25, 

 lat. 20; apertura, long. 18, lat. 11 mm. 



Sab. — Lagunella, Venezuela. 



A small oval shell, with, a moderate, rather narrow umbilicus, 

 depressed, but not channelled at the suture, the top of the body- 

 whorl forming an obtuse rounded angle. The sides are rather less 

 roundly convex than most of the species of this group. The surface 

 is rather irregularly striated, of an olive-tinted brown colour, with 

 numerous rather faint transverse brown lines, which become more 

 distinct towards the aperture. 



Ampullaeia inteerupta, n.sp. 



Testa imperforata, solidula, ovata, viridis, varicibus planulatis, 

 vix elatis, luteo strigatis, fusco raaculatis ornata, longitudinaliter 

 irregulariter plicata, subtilissime corrugatim striata ; spira conica, 

 elatiuscula ; anfractus 6, convexi, sutura angusta sejuncti ; ultimus 

 -2" longitudinis testae sequans, supra rotundatus, infra levissime 

 attenuatus ; apertura ovata, antice latiuscula, postice angustior, fauce 

 fusca; labrum intus cteruleo fasciatum, ad marginem fusco tessellatum; 

 columella crassa, alba, leviter sinistrorsum effusa. Operculum 

 corneum, nigro-fuscum. Long. 28, lat. 22 ; apertura, long. 18, 

 lat. 12 mm. 



Hah. — Laguna TJrao, Venezuela (Da Costa). 



This small species is allied to A. colmnellaris, D'Orb., and 

 Castelloi, Sow., belonging to Ball's section Limnopomus. It is 

 chiefly distinguished by its prettily coloured varices, which are 

 scarcely raised, but rendered conspicuous by dark-brown spots 

 bordered with yellow. The shell is otherwise green ; its surface is 

 apparently smooth, but beneath the lens it is seen to be very finely 

 corrugately striated. 



Ampullaria levior, n.sp. 



Testa mediocriter umbilicata, conico-ovata, tenuis, pallide fulva, 

 griseo-fusco raultifasciata, hie illic malleata, longitudinaliter striato- 

 plicata, transversim obscurissirae striata et crenato-lirata; spira conica, 

 elatiuscula; anfractus 5, rotunde convexi; ultimus f longitudinis 



VOL. VIII. — SEPTEMBER, 1909. 28 



