100 LIMN^A. 



** Shell small, narrow, with elevated sjnre. 

 ■f British and Danish American Species. 



15. LIMN^A ARCTICA, Lea. 



Plate 17, fig. 9. 



Shell elliptical, somewhat inflated, rather 

 thick, not umbilicate, minutely striate, pale 

 horn-color ; spire obtuse, decorticated ; sutures 

 impressed ; whorls convex ; aperture broadly 

 elliptical, rather large ; outer lip regularly ex- 

 panded; columella thickened in the middle 

 and furnished with a large fold. 



Length 10, diam. 6 mill. 



Moose River of Hudson's Bay, Arctic 

 America. 



16. LIMN^A YAHLII, Beck. 

 Plate 17, fig. 10. 



Shell ovate, convex, spire moderate, apex 

 obtuse, decorticated ; whorls six, with well- 

 marked sutures; aperture large, ear-shaped, 



(74) 



