148 VITRINA. 



oval, the margins approaching, the columellar margin shortly 

 reflected. Diam. 4, alt. 3 mill. 



Caucasia. 



II. Species of the Canary and Madeiran Islands and Azores. 



Y. LAMABCKII, Fer. PL 32, figs. 69-71. 



Depressed, oval, smooth, thin, shining, yellowish corneous, 

 sometimes slightly greenish, spire somewhat plane ; whorls 2J, 

 rapidly increasing ; aperture large, subhorizontal, ear-shaped, 

 outer margin arcuately dilated above, columellar margin widel}' 

 membranaceous, base imperforate, but the aperture showing the 

 spire. Diam. 15, alt. 5*5 mill. 



Canary Islands. 



V. Teneriffse, Quoy, is a synonym. 



Y. RUIVENSIS, Couthony. PI. 32, figs. 72-74. 



Haliotiform, transversely subquadrate-oval, depressed, papy- 

 raceous, pellucid, shining, greenish yellow; whorls 2 or 2^, 

 flattened above, with slight suture ; aperture very large, 

 showing the spire. Diam. 13, alt. 4*5 mill. 



Madeira. 



V. Lamarckii, var., and V. Behnii, of Lowe, are synonyms. 



Y. BRUMALIS, Morelet. PI. 32, figs. 81-83. 



Depressed-auriform, almost membranaceous, very thin, pel- 

 lucid, shining, greenish hyaline ; spire plane, suture narrowly 

 margined ; whorls 3, rapidly increasing, the last depressed, 

 large ; aperture subhorizontal, showing the spire, the colu- 

 mellar border very narrow and almost wholly membranaceous. 



Diam. 9, alt. 4 mill. 



S. Miguel, Azores. 

 Y. BREVISPIRA, Morelet. PL 32, figs. 87, 88. 



Differs from V. brumalis, in being a little smaller, the spire 

 more minute and lateral, the whorls 2^ instead of 3, suture 

 somewhat crenulated, columellar margin somewhat narrower 

 and straighter. Diam 8, alt. 4 mill. 



Sta. Maria, and S. Miguel, Azores. 

 Y. MOLLIS, Morelet. PL 32, figs. 89-91. 



A little larger than V. brumalis, more rounded in outline, the 

 basal volution more rounded both above and below, surface 



