I 



ZON1TES. 173 



*** European and North American Species. 



H. FULVA, Drap. PL 53, tigs. 35-39. 



Imperforate, turbinately globose, thin, pellucid, smooth, shin- 

 ing, minutely striated, amber-colored ; whorls 5-6, convex, very 

 narrow, with deep suture, aperture transverse, narrow, umbilical 

 region indented. Diam. 4 mill. 



Circumpolar ; Europe, Azores, Caucasus, 



Clnna, Kamtschatka, Sit/ca, United States to 



Texas and Florida, Atlantic to Pacific regions. 

 American specimens were described by Say as H. chersina. 

 "It offers but few varieties, and is easily distinguished by its 

 conical form and thin, amber-colored, transparent shell. It is a 

 very beautiful and delicate little species. The spire is elevated, 

 turreted, attaining even seven full volutions, with an obtuse apex; 

 ut o'her times it is much lower, with a somewhat pointed apex, 

 and not exceeding five volutions. In the latter case the base is 



d? 



of course much broader in proportion to the height, and the 

 outer whorl is obtusely carinated. This carinated form is H. 

 egena, Say (fig. 39)." W. G. BINNEY. 



Other synonyms are H. trochiformis, Montagu; //. frochuhts, 

 Dillwyn ; H. trochilus, Fleming ; ff. nitidula, Alten ; //. Man- 

 <lralisci, Bivona. 



Yar. ALDERI, Gray. 

 Shell smaller, darker. 



Yar. MORTONT, Jeffreys. 



Shell lighter colored, somewhat depressed, spire convex, last 

 whorl obtusely carinated. 



If this variety is maintained, it must bear the earlier name of 

 egena, Say. 



The known variabilit}" of this shell favors the supposition that 

 H. callopisticus and H. vesperalis, Bourg. (unfigured), recently 

 dismembered from it, are at most only varieties. 



H. FABRICII, Beck-. PI. 53, fig. 40. 



Subimperforate, conical, thin, striulate, pellucid, fulvous; 

 whorls 6, convex, narrow, the last wider, base a little convex, 

 impressed in the middle, suture profound. Diam. 4 mill. 



Greenland, Labrador. 



Scarcely distinguished from H. fulva by its wider last whorl, 



