LYUNJEIDJE OF NORTH AMERICA. 



401 



some specimens and coarser in others, crossed by very indistinct 

 spiral impressed lines; in old specimens the shell becomes very rough 

 and eaten away by the excess of carbon dioxide in the. water ; whorls 

 3^2 in perfect specimens, but generally only 2 to % l /2 remain intact, 

 the tip of the spire being decollated; the whorls are rather flat sided 

 on the spire, the body whorl alone being ventricose and sometimes 

 roundly sloping above the periphery; apex light horn color, small, 

 rounded ; spire very short, broadly conic, generally decollated ; sutures 

 tightly appressed, in some specimens distinctly impressed; aperture 

 large, ovate, occupying two-thirds the length of the shell, in old speci- 

 mens distinctly campanulate; peristome thin, acute; the outer lip is 

 inclined to thicken within the aperture and a transverse varix edged 

 with reddish brown is sometimes formed; inner lip reflected over the 

 parietal wall and umbilicus, tightly closing the latter; the axis is 

 slightly twisted and there is a well marked fold. 



Length. 

 15.00 

 15.00 



12.00 



12.25 



11.25 



9.75 



11.00 

 11.75 

 12.00 

 14.00 

 17.00 

 15.25 



Breadth. 



12.50 mill. (Mighels .6 by .5 inch.) 

 10.50 " Tryon. 



Aperture length. Breadth. 

 8.00 9.00 



8.00 



7.75 

 7.00 



7.50 



8.00 



8.50 



11.50 



11.25 



11.00 



9.00 

 8.00 

 7.00 



8.00 



8.25 



8.50 



9.25 



12.50 



11.50 



5.50 mill. Walker, received from Mi- 

 ghels. 



5.50 " Walker, received from Mi- 

 ghels. 



5.00 " Walker, received from Mi- 

 ghels. 



4.50 " Walker, received from Mi- 

 ghels. 



Walker (J. G. Anthony). 

 Phil. Acad. Sci. 

 Smith. Inst. 



5.00 

 5.00 

 4.50 

 7.00 

 6.50 

 6.25 



Bost. Soc. N. H. 



TYPES: Destroyed in Portland fire of 1866. Specimens received 

 from Mighels are in the collection of the Academy of Natural Sci- 

 ences, Philadelphia, No. 58703 ; in the Boston Society of Natural 

 History, No. 24192; the Chicago Academy of Sciences, No. 23811 and 

 in the collection of Mr. Bryant Walker. 



TYPE LOCALITY: Lake Wirinecook, Unity, Waldo Co., Maine. 



ANIMAL: "Dingy mouse-color, with a slight tinge of purple; 

 covered with numerous microscopic, elongated white spots on every 

 visible part of the surface, including the mouth and tentacula; foot 

 of a chocolate color, rather broad, length rather greater than the 

 aperture." ( Mighels ) . 



