138 SOUTHERN SPECIES. 



Helix (Arionta) Ayresiana, Newcomb, Ayrs-i-an'-a, 

 is a species from three other islands with similar 

 sacred names — Santa Rosa, San Miguel and Santa 

 Crnz. 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 {Arionta) 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 with microscopic striae. Its greater 

 diameter is one inch. 



Arionta Carpentcri, Newcomb, is probably a vari- 

 ety of Trash] but it has a more delicate shell. It 

 comes from Coronado Island and Mexico. 



