[22 ] 

 12. Succinea Groenlandica, Beck. 



Plate 3, figure 13. 



Elongated, strongly wrinkled ; spire elevated, suture well 

 impressed ; body very large proportionally, not inflated ; aper- 

 ture oval, three-fifths the total length. Covered with an 

 opaque, somewhat shining, horn-colored epidermis, with narrow 

 white lines caused by its abrasion from the elevated striae. 



Length 8, diam. 5J mill. 



Greenland, and Mingan Island, Gulf of St. Lawrence. 



13. Succinea Gabbii, Tryon. (Nov. sp.) 



Plate 2, figure 14. 



Elongate ovate, thin, sub-pellucid, coarsely undulately stri- 

 ate ; spire long, acute, suture deeply impressed ; whorls nearly 

 4, but slightly oblique, very convex, the last three-fourths of 

 the total length ; aperture small, roundly oval, columella well 

 incurved. Light yellowish. 



Length 9, diam. 5 mill. 



Crooked Creek of Owyhee, 60 miles W. of boundary S. E. 

 Oregon. Crane Lake Valley, N. E. Cal.— W. M. Gabb. 



Larger and more convex than Groenlandica, and differently 

 colored. The spire is proportionally longer in this than in 

 the other species of the group. 



li. Succinea Verrilli, Bland. 



Plate 2, figure lo. 



Ovate conic, thin, sub-pellucid, striate; spire elevated, obtuse, 

 ape'x globose suture well impressed; whorls 3, very convex, 

 not very oblique ; aperture roundly oval, small, columella ar- 

 cuate with a slight callus. Orange yellow, apex reddish. 



Length 7, diam. 3'5 mill. 



Salt Lake, Anticosti Island, Gulf of St. Lawrence. 



Smaller than Gro&nlandica, of different color, and has more 

 distinct and regular incremental striae. 



