110 



70S a. Hrlicina ßarbadevsis Pfr. 



T. sublcnticularis, tenuis , sub lente IiTCgularitor ru- 

 gnlosa, hniul nitida, cliaphana, lutescenti - albifla : spira 

 breviter coiioidea , acuminatiuscula ; sutura vix impressa- 

 anfr. 4^/.2 subplanulati, celeriter accresccntes, ultiniiis utrin- 

 que convexiusculus , peripheria acute carinatus : oarina antice 

 obsoletiore ; columella brevissima , calliim emittens parvu- 

 lum , circuniscriptum ; apertura diagonalis, triangiilari-semi- 

 ovalis; perist. simplex, imdique reflexiusculum. — Operc.? 

 — Diam. maj. 6, min. 5, alt. 3 mill. 



Helichm Barbadejisis Pfr, in Proc. Zool. Soc. 1853. 



Habitat in insula Barbadoes. 



725 a. Alcadia ruhella Pfr. 



T. conoideo-depressa , tenuis, striatula, breviter pilosa 

 (detrita oleoso - micans , diaphana) , rubello - Cornea ; spira 

 convexa, vertice mucronulato; anfr. Ö^/g angusti, vix con- 

 vexiusculi, ultimus peripheria obsolete subangulatus , basi 

 convexior; apertura fere diagonalis, semilunaris; columella 

 brevis, in denticulum sulco a callo basali tenuissimo sepa- 

 ratum desinens; perist. tenue, undique breviter expansum, 

 marmne basali subrectilineari , incisura levi a columella 

 distincto. — Operc. membranaceum , concolor. — Diam. 

 maj. 61 3, min. S^y^j ^1^- ^ mill. 



Helic'ma (Alcadia) ruhella Pfr. in Proc. Zool. Soc. 

 1853. 



Habitat in insula St. Thomas. 



726 h. Alcadia Gundlachi Pfr. 



T. conoidea-depressa, tenuis, sub lente rugulosa, vix 

 nitidula, corneo-rubella ; spira brevis, regulariter conoidea; 

 sutura impressa, pallide submarginata ; anfr. 5 convexius- 

 culi, sensim accresccntes, ultimus magnus, rotundatus, ad 

 peripheriam obsoletissime angulatus et pallide zonatus, basi 

 convexiusculus ; columella brevis, in denticulum retroflexum 

 desinens, superne callum emittens tenuem, vix circum- 

 scriptum; apertura obliqua, semiovalis; perist. brevissime 



