480 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



COCHLOSTYLA (CHRYSALLIS) LICHENIFER (Morch) 



Shell of medium size, elongate-ovate, rather smooth. The early 

 whorls are pale brown, the last one of considerably darker ground 

 color marked by figurations of yellowish-white axial bands. Interior 

 of aperture bluish white edged with purplish brown, which also 

 forms a zone at the outer edge of the parietal callus, while the callus 

 itself is of the same color as the interior of the aperture. The post- 

 nuclear whorls are slightly rounded, appressed at the summit, and 

 marked by rather closely spaced lines of growth, which make the 

 spaces between them look like flattened, slender, appressed threads. 

 The entire surface of the shell is marked by numerous fine incised 

 lines, which cross the lines of growth obliquely both protractively and 

 retractively and give to the surface, under the microscope, a finely 

 fenestrated pattern. The aperture is broadly ovate, oblique; the 

 peristome is decidedly expanded all around and reflected over the 

 parietal wall as a heavy callus. 



I am recognizing two subspecies of this species: Cochlostyla lichenifer 

 lichenifer (Morch), which I have not seen, and Cochlostyla lichenifer 

 avittata, a race of which a specimen was collected by Dr. Edgar A. 

 Mearns on the Mount Halcon Expedition. The two races can be 

 distinguished as follows: 



KEY TO THE SUBSPECIES OF COCHLOSTYLA (CHRYSALLIS) LICHENIFER 



Peripheral zone of brown present lichenifer 



Peripheral zone of brown absent avittata 



