VI^RINA. 149 



smoother, color darker, aperture not so transverse, and the 

 extremely membranaeeous incurved columellar margin much 

 wider, although permitting a view of the spire through the 



aperture. Diam. 10, alt. 5-5 mill. 



Terceira, Azores. 

 Y. FINITIMA, Morelet. PI. 32, figs. 84-86. 



Convexly depressed, auriform, very thin, shining, pellucid, 

 smooth, greenish yellow; spire short, obtuse, plane, suture 

 narrowly margined ; whorls 2J, rapidly increasing, the last 

 flatly rounded ; aperture nearly horizontal, rounded-ovate, 

 showing the spire ; lip-margin distinctly thickened and slightly 

 reflexed above, free and membranaeeous below r . 



Diarn. 8, alt. 3*5 mill. 



Flores, Azores. 

 Y. LATEBASIS, Mousson. PI. 32, figs. 75-77. 



Depressed, transversely oblong, thin, smooth, substriatulate, 

 very shining, light yellowish green ; spire plane, suture white- 

 margined ; whorls 2^, rapidly increasing, the last dilated ; aper- 

 ture large, oblique, subauriform, the lip incurved, callously 

 covering the columellar region. Diam. 13, alt. 6'5 mill. 



Canary Islands. 

 Y. BLAUNERI, Shuttleworth. PL 32, figs. 78-80. 



Depressed, transversely oblong, smooth, very shining, light 

 yellowish green ; spire plane, suture linear, margined ; whorls 

 3, rapidly increasing ; aperture oblong, oblique, margins 

 approaching, slightly callous over the axis, and joined by a thin 



callus. Diam. 17, alt. 6 mill. 



Canary Islands. 



A little more solid and less transparent than the preceding 

 species, with smaller aperture, and a small but appreciable 

 lamellar dilatation of the peristome covering the axis, con- 

 tinued as a slight callus to the insertion of the upper lip. 



Y. CANARIENSIS, Mousson. PI. 32, figs. 92-94. 



Globosely depressed, oval, very smooth and shining, pellucid, 

 greenish corneous ; spire slightly convex, with linear, not dis- 

 tinctly margined suture ; whorls 3, rapidly increasing, the last 

 large but not dilated ; aperture diagonal, widely ovate, oblique. 



Diam. 11, alt. 5*5 mill. 



Canary Islands. 



