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PROCEEDINGS OF THE NATIONAL MUSEUM. 



Variation in the number of rihs in Ilolospira {Ilolospira) goldfussi. 



Variation>< in. the number of ribs in Holospira {Holospira) goldfussi anacachensis. 



Number of Ilolospira {Holospira) goldfussi Menke examined. 



Number of Holospira (Holospira) goldfussi anacachensis examined. 



aOne=type. 



The type comes from Frying Pan Valley, 6 miles southwest of 

 Cline, Texas. It has 13 whorls and measures: Length, 12.1 mm,; 

 diameter of penultimate whorl, 3.2 mm.; diameter of tenth whorl, 3.7 

 mm. The penultimate whorl has 22 ribs, the tenth whorl, 30. 



