HYALINA. 



4T 



■ Eelix egena, Say, Journ. Pliila. Acad. V, 120 (1825) ; Binnet's ed. 30.— 

 DeKay, N. Y. Moll, 45 (1843).— Chemnitz, ed. 2, I, 237, pi. xsx, f. 

 19-21 ? (1846).— Reeve, Con. Icon. no. 12ti3 (1854).— Pfeifkih, 

 Mon. Hel. Viv. I, 31, not .of Godld in Terr. Moll. 



Eelix fulva, Draparnacd, teste Mighels (Bost. Journ, IV. 333), Chem- 

 nitz, Pfeiffek (Mon. H. I, 30), Reeve, Fokbes and Hanley. 



Conulus ckersinus, Mokse, Journ. Forth Soc. I, 19, f. 44, 4tj, pi. ii f. 4 ; 

 pi. vii, f. 45 (1864). 



Conulux chersma, Tkyon, Am. Journ. Conch. II, 256, pi. iv, f. 37 (1866), 



Common to the boreal regions of the three continents. It 

 appears to inliabit all of eastern North America, having been 

 found from Great Slave Lake to Texas and Florida. Dr. New- 

 comb catalogues it among the species found 

 at Lake Tahoe, California. 



Jaw arcuate, ends attenuated ; anterior 

 surface smooth ; concave margin smooth, with 

 an obtuse median projection. 



Lingual membrane with 80 rows of ST 

 teeth each (18—1—18) ; centrals with a 

 long median and very short lateral cusps ; laterals of the same 

 shape, but bicuspid ; uncini aculeate, bifurcate. 



Pig. 75. 



Fig. 74. 



Jaw of 



Hyalina chersina. 



[Moese] 



Lingual dentition of Hyalina chersina. [Morse.] 



Hyalina fabricil, Beck,— Shell subimperforate, coni- Fig, 76. 

 cal, thin, lightly striated, pellucid, reddish ; spire conical, 

 rather acute ; suture profound ; whirls six, convex, narrow, 

 the last wider, rather convex at base, impressed at the centre ; 

 aperture vertical, widely lunar; peristome simple, acute, its Hyalina 

 columellar extremity reflected above, siiuulating a perforation. fabrioii. 

 Greater diara. 4, lesser 3^ ; height 3 mill. 



