VERTIGO. 173 



flat ; aperture semi-oval, edentulous ; peritreme nearly simple, a 

 little reflexed, margins joined by a callus. 



atomus, Shitttl. lucida, Jan. 



columella, Bcnz. microspore, Loive. 



dealbata, Webb and Berth. miuutissima, Hartm. 



dilucida, Ziegl. Novoseelandica, Pfeiff. 



edentula, Drop. Paredesii, UOrb. 



fuuicula, Val. Riisei, Pfeiff. 



fusulus, M'ull. truncatella, Pfeiff. 

 inornata, Mich. 



Sub-gen. odontocycxas, Scbl litter (Scopelopbila, Alters. Sca- 

 rabella, Loive. Eryma, Albers). 



Sbell sub-perforate or flexuously rimate, conic or ovate, 

 striated ; spire convexly conical, apex obtuse ; whorls slightly 

 convex, the last compressed at the base, sometimes laterally pro- 

 duced and ascending ; aperture triangularly oval or semi-circular, 

 dentated ; peristome simple, a little expanded, the left margin 

 often sinuous, the right callous or dentated within. 



calathiscus, Loive. Kokeillii, Rossm. 



cassida, Lowe. plicidens, Bens. 



cassidula, Loive. Rossmassleri, Schmidt. 



Sub-gen. alvearella, Lowe. 



Shell arcuately rimate, ob-ovate, smooth or striated ; spire 

 ovate or ventricose, apex obtuse, whorls convex, the last narrow, 

 with the base compressed, scrobiculate in front ; aperture verti- 

 cal, sub-triangularly oblong, dentated; peristome callous, re- 

 flexed or expanded. 



capitata. Gould. ovularis, Oliv. 



concinna, Lowe. Pfeifferi, Krauss. 



gibba, Lowe. Sturmii, Kiist. 



Menkeana, Pfr. Wahlbergi, Krauss. 



VOL. II. A A 



