THE NAUTILUS. 



VOL. XI. NOVEMBER, 1897. No. 7. 



NEW SPECIES OF MEXICAN LAND SHELLS. 



BY W. H. DALL. 



Helix (Lysinoe) Queretaroana n. sp. 



Shell large, rugose, with a pale yellow-brown periostracum over a 

 livid whitish, finely granular surface ; whorls five, sloping above, 

 with a well marked suture, to a rather elevated narrow apex ; below 

 rounded ; nuclear whorl and a half smooth, perhaps with micro- 

 scopic punctuations when unworn ; the rest of the surface rugose 

 from irregular incremental lines and densely covered with minute 

 rounded pustules; apex with a few darker flecks on the whitish 

 ground, but otherwise the shell is destitute of color pattern and 

 entirely without banding; aperture ample, oblique, outer lip simple, 

 not reflected, internally somewhat thickened by a livid rose-colored 

 callus; inner lip rose color, reflected, nearly covering a small 

 perforate umbilicus ; throat brownish, deeper just below the suture 

 on the body whorl, a thin callus connecting the somewhat incurved 

 outer lip with the pillar; base turgid, rounded. Alt. 37, max. 

 diam. 39, min. diam. 32 mm. 



Final de Amoles, Queretaro, Mexico, E. W. Nelson. 



This fine species is related to H. Humboldtiana, from which it is 

 easily distinguished by its color, more pointed spire and less de- 

 pressed apex. The rose color of the interior becomes less bright 

 with time. 



Helix (Lysinoe) sebastiana n. sp. 



Shell large, moderately depressed, of four and a half whorls, with 

 a well marked suture; nepionic whorls two, smooth, plum colored; 



