NO. 1483. 



UROCOPTin MOLL USKS—BARTSCH. 



181 



pandcd and somewhat rcvolute, white, fading- to light brown within. 

 Internal piUar .slender, hollow throug-hout, having a low submedian 

 twist, which extends over the entire spire. In the last and penulti- 

 mate whorl this twist is replaced by a moderately strong, rather thick 

 spiral lamella, which is of about equal strength in the two whorls men- 

 tioned; it can be easily seen within the aperture, but does not extend 

 into the penultimate whorl. The parietal lamella extends through the 

 last two turns and is also visible deeply within the aperture ; it is 

 slender, quite wide and decidedly outward curved, the free edge point- 

 ing toward the rounded, cord-like peripheral fold, which is located a 

 little below the middle on the inside of the outer wall; it transverses 

 only part of the penultimate whorl. A narrow slit only separates 

 these two lamelh\3. The basal lamella is very much reduced and sur- 

 passes the peripheral lamella in height only for about a quarter of a 

 turn. The peripheral fold is visible on the outside of the whorl as a 

 white thread. The collection contains 4-i specimens. Cat. No. 187675, 

 U.S.N.M., all collected by J. N. Rose and J. H. Painter, at Tehuacan, 

 Puebla, Mexico. The following table gives measurements of twenty 

 specimens: 



Meamrements of Ilolospira {Ilolospira) painteri. 



a Type. 



