224 ALCADIA. 



17. nincilenta Ail. (Grmj Phan. p. 301. — Ad. 



Gen. p. 307. — HcUc. inacUenta C. B. Jd.J . . Mon. p. 411. 



IS. A. rulielia Pfr. 



T. conoideo-depressa, tenuis, oblique striatula, pilosa (de- 

 trita oleoso-micans, diaphana), rubello-cornea; spira convexa, 

 vertice mucronulato; anfr. SVa angusti, vix convexiusculi, 

 ultimus peripheria obsolete subangulatus, basi convexior ; aper- 

 tura fere diagonaHs, semilunaris ; columella brevis, in denticu- 

 lum sulco a callo basaH tenuissimo separatum desinens; perist. 

 tenue , undique breviter expansum , margine basaH subrectiH- 

 neari, incisura levi a columeUa distincto. — Operc. membra- 

 naceum, concolor. — Diam. maj. 6^/3, min. S*/^, alt. 4 miU. 

 (CoH. Nr. 153.) 



Helkina rubella (Alcadia) Pfr. in Proc. Zool. Soc. 1853. p. 60. 



Alcadki rubella Pfr. in Malak. Bl. I. 1854. p. 110. 

 — — //. et A. Adams Gen. II. p. 307. 



Habitat in insuHs St. Thomas et St. Jan Indiae occidentaHs. 



19. A. Ciiiiiidlaclii Pfr. 



T. conoideo-depressa, tenuis, sub lente rugulosa, vix ni- 

 tidula, corneo-rubella ; s^^ira brevis, regulariter conoidea; su- 

 tura impressa, paUide submarginata ; anfr. 5 convexiuscuH, 

 sensim accrescentes, uhimus magnus, rotundatus, ad periphe- 

 riara obsoletissime angulatus et pallide zonatus, basi convexius- 

 culus; columella brevis, in denticuhim retroflexum desinens, 

 superne caHum emittens tenuem, vix circumscrlptum ; apertura 

 obliqua, semiovalis; perist. brevissime expansiusculum, mar- 

 gine basaH subrectiHneari, incisura brevi a columeHa separato. 

 — Operc. membranaceum, carneum. — Diam. maj. 51/2, 

 min. 5, alt. 32/3 miU. (CoH. Nr. 154.) 



Alcndia Gundlachi Pfr. in Malak. Bl. I. 1854. p. 110. III. 1856. p. 150. 

 Habitat in insula Cuba (Dr. Gundlach). 



20. iiispida Pfr. (Coll. 155. — Gray Phan. p. 301. 

 — Ad. Gen. p. 307. — Pfr. in Malak. Bl. 1856. 

 p. 150. — Helic. hispida Pfr. i839. — Helic. den- 

 tigcra Orb.) Mon. p. 412. 



21. A. capaiK dmcllach. 



T. conoideo-globosa, ambitu orbicularis, tenuis , striatula 

 et sub leute punctulata, peHucida, aurantiaco-succinea; spira 



