70 CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Explanation, Plate VI 



Fig. 1. Epiphragmophora petricola orotes, new subspecies, type. Por- 

 tion of upper surface of last two whorls a short distance behind the aper- 

 ture, magnified about 20 diameters to show the periostracal sculpturing. 



Fig. 2. Epiphragmophora petricola orotes, new subspecies, type. Por- 

 tion of basal surface of last whorl just behind the aperture, magnified 

 about 20 diameters. 



Fig. 3. Epiphragmophora petricola orotes, new subspecies, type. Por- 

 tion of apical region, magnified about 20 diameters to show the perios- 

 tracal sculpturing. 



(All photographs used on this plate reversed.) 



