[38] 

 11. Hyalina subplana, Binney. 



Plate 4, figure 23. 



"Whorls 5|, planulate above and below, brownish, sliining, 

 striated near the apex, suture not much impressed ; aperture 

 transverse, without calcareous deposit within ; umbilical re- 

 gion but slightly impressed, umbilicus very narrow. 



Diam. 18 mill. ^oi: -T: (x v .2 ; Sc.\ up. 



East Tennessee to Western Pennsylvania. 



Differs from ff. cellaria in having a narrower umbilicus, 

 and from both that and S. inornata in the absence of a cal- 

 careous deposit on the interior of the aperture at the base ; it 

 is darker colored, larger, and has more whorls than either of 

 them, and is more regularly flattened. 



ft f f Shell small, diameter not exceeding 6 tyiHI., umbilicus gene- 

 rally narrow and deep. 



12. Hyalina Breweri, Newcomb. 



Plate 4, figure 27. 



Discoidal, pale corneous, shining, transparent, suture slightly 

 channeled, broadly umbilicate ; whorls 5 ; aperture lunate, 

 lip thin, simple. 



Diam. 5 mill, altitude 2.5 mill. OoIlM^"- 0..'-'!^ • 



Lake Taho, California. 



Less elevated, more polished, lighter colored, and more 

 openly umbilicate than II. arhorea. 



13. Hyalina nitida, Miiller. 



Plate 4, figure 24. 

 Whorls 4|, depressed, conically sloping above, with well 

 marked suture, convex below; umbilicus moderate, but deep; 

 aperture well rounded. Amber colored. 



Diam. 6, altitude 3 mill. 1 



New York to Ohio, and northwards to Great Slave Lake. 



More conical and rather larger than E. arhorea This spe- 

 cies was first detected by Dr. Ingalls at Greenwich, New 

 York, who called it H. hydrophila. It was subsequently 



