4& 



Diagnosen neuer Landschnecken. 



Von Dr. L. Pfeiffer. 



1. Helix Tvedereri Pfr. 



T. iimbilicata, gradato-conoidea, confertiin oblique pli- 

 cata, opaca, calcareo-albida; spira elevata , apice minuto ; 

 anfr. 5 seiisiin accre^ceiite« , oiiine« planiusculi, exserti, 

 subacute crenato-cariiiati, ultimum noii deiscenden«, basi con- 

 vexiiö; umbilicuö '/g diainetri dubaequans ; apertura parum 

 obliqua, rotundato - securiformis ; perist. rectum, intus vix 

 sublabiatum , margine columellari subdilatato. — Diam. 

 maj. IOV2, ii^ij^- '^ ^^^' ^^/3 "^ilJ- 



liabitat in insula Cypro teste Stentz. 



2. Helix Mazatlanica Pfr. 



T. umbilicata, depressa, confertim costulato-striata, Cor- 

 nea; spira parum convexa; anfr. 4 convexiusculi, sensim 

 acerescentes , ultimus teres, antice vix descendens; umbili- 

 cus ^/3 diametri fere aequans; apertura obliqua, lunato-ro- 

 tundata; perist. simplex, rectum, marginibus conniventibus, 

 columellari superne subpatulo. - Diam. maj. 2^!^, min. 2, 

 alt. vix 1 mill. 



Habitat Mazadan in parte occidentali reipublicae mexi- 

 canae, teste E. Klocke. 



o. Helix B a r a c o c n s i s G u t i e r r e z. 



T. imperforata, depressa, ambitu auriformis, solida, 

 valide plicata, rugulis obliquis oblique decussata, sub epi- 

 dermide sordide lutescente alba; spira breviter conoidea, 

 vertice subtili : anfr. 4 convexinsculi, cclerher acerescentes, 

 ultimus antice inflatus et constrictus, deticxus, latere aper- 

 turae opposito subangulatus, basi leviter radiato-striatus ; 

 apertura fere horizontalis , subtriangulari-lunaris ; perist. 

 crassum, marginibus callo junctis, dextro arcuato, reiiexo, 



