78 THE NAUTILUS. 



whorl, termination of the body-whorl sharply descending at the 

 aperture to about the middle of the whorl. Aperture very oblique ; 

 lip obtusely angled and almost perpendicular below the middle of 

 the whorl ; strongly constricted behind the reflected lip ; peristome 

 well expanded above, narrower below, somewhat flexuous, united 

 over the body by a thin callus ; parietal lamellae two, converging, 

 but not united at the inner end into a V; the lower lamella stout, 

 sinuous, the outer end bent sharply towards the umbilicus; the 

 upper lamella low, narrow and straight, starting near the upper in- 

 sertion of the lip and terminating back of the front end of the lower 

 lamella ; basal part of the peristome with two strong lamellae trans- 

 verse to the lip, the upper ends converging and united at the base 

 on the lip, forming a U ; a broader and less transverse lamella set 

 more deeply within the aperture on the upper lip, a small internal 

 lamella on the base of the body whorl about three or four mm. long, 

 showing faintly through the shell. 



Greater diameter 20^, lesser 18, alt. 6| mm. Black Mountain, 

 at the southern end of the San Andreas Range, Donna Ana county, 

 New Mexico, at an elevation of about 6,800 feet. 



This interesting shell was first collected by Mr. Walter E. Koch 

 over a year ago. He sent me one perfect and one broken shell. 

 Lately he has sent me three additional specimens, also dead. He 

 reports dead shells quite plentiful in the crevices of a limestone cliff, 

 but was unable to find living ones. I take great pleasure in naming 

 the shell after him. 



Type no. 5765 of my collection. 



A. kochii is undoubtedly closely related to A. mearnsii, but is 

 very much larger, more strongly carinated, and differs markedly in 

 the umbilical region. 



Both of these species will be figured on plate VI, to appear next 

 month. 



NOTES ON THE GENUS 8TEOBILOPS. 



BY HENRY A. PILSBRY. 



The small forest-snails known as Strobilops are spread throughout 

 all parts of North America east of the Rockies where sylvan condi- 

 tions prevail, from Canada to Florida, Mexico and Central America. 



