138 SOUTHERN SPECIES. 



Helix {Ariontd) Ayresiana^ Newcomb, Ayrs-i-an'-a^ 

 is a species from three other islands with similar 

 sacred names — Santa Rosa, San Miguel and Santa 

 Cruz. The shell is quite strong, six-whorled, and 

 has a considerably elevated spire and a distinct umbil- 

 icus. The outer lip is sharp and is but slightly 

 reflected at the umbilicus. Microscopic striae may be 

 traced upon the shell. It is of a brown or chestnut 

 color, and is usually girdled with a broad dark band. 

 Its diameter is three-fourths of an inch. 



Helix {Ariontd) Traski^ Newcomb. This is a 

 coast species found in the vicinity of Los Angeles. 

 Whorls six, spire but little elevated, apex flattened, 

 umbilicus distinct, peristome but little widened except 

 near the umbilicus. Shell horn-colored, girdled by a 

 dark chestnut band edged with yellow. The interior 

 is white, but it shows the dark band. The surface 

 is usually marked w^ith microscopic strise. Its greater 

 diameter is one inch. 



Arionta Carpenteri^ Newcomb, is probably a vari- 

 ety of Traski^ but it has a more delicate shell. It 

 comes from Coronado Island and Mexico. 



