[ 53 ] 

 3. Pseudohyalina incrustata, Poey. 



Plate 4, figure 61. 



Depressed, spire slightly elevated, suture deep; whorls 4-5, 

 well rounded,, slowly increasing; mouth expanding, nearly 

 circular, the ends of the lip-margin closely approaching and 

 united by a callus; umbilicus one-third the entire diameter, 

 showing all the whorls. Brown, with a ferruginous deposit. 



Diam. 3, height IJ mill. 



Texas (from Cuba'.'") Cell .i-r, .^ rjvi 



4. Pseudohyalina conspecta, Bland. 



Plate 4, figure 58. 



Umbilicate, sub-depressed, thin, with oblique, rather distant, 

 rib-like stri« ; dark horn color ; spire convex, apex obtuse, 

 smooth, suture deep ; whorls 4, convex, gradually increasing, 

 slightly descending towards the mouth ; aperture oblique, lu- 

 nate-rounded, margins approaching. 



Diam. 2, altitude 1 mill. OoU-^^^^-. 



San Francisco, California. 



The spire is more raised, and the ribs more numerous and 

 not so prominent as in S^. asteriscus. It is distinguished from 

 ff. Mazatlanica, by its more distinct ribs and smaller umbilicus. 



*** Diam. = l-lj mill. 

 5. Pseudohyalina exigua, Stimpson. 



Plate 4, figure 57. 

 Discoidal, a little convex above, suture moderate; whorls 

 3 1, spirally striate, with oblique transverse ribs ; aperture 

 rounded; umbilicus wide, shallow, exhibiting the volutions. 



Diam. If mill.- . ■ . l 



Canada, Massachusetts, Minnesota, around Lake Superior. 



6. Pseudohyalina millium, Morse. 



Plate 4, figure 56. 

 Depressed, convex above, transparent, shining, distinctly 

 and regularly striate above, with microscopic revolving lines, 

 more apparent beneath; whorls convex, rapidly enlarging; 

 suture very deeply impressed ; umbilicus quite large and deep, 

 exhibiting all the> volutions. White, with a greenish tinge. 



, Diam. 1|, height | mill. 



CUV. aivf." Maine. 



