136 



PROCEEDINGS OF THE. NATIONAL MUSEUM. 



HOLOSPIRA (BOSTRICHOCENTRUM) VERACRUZIANA Ball. 



There are three specimeus of this species in the collection of the 

 U. S. National Museum, Cat. No. 569,33, collected by the Mexican 

 Geoo-raphic Commission, at Mizantla, Vera Cruz, Mexico. They give 

 the following measurements: 



Measurements of I/o/osjiint {Bostrichocevtrum) veracrnziana . 



n Type. 



'' Not quite mature. 



HOLOSPIRA (BOSTRICHOCENTRUM) GOLDMANI, new species. 



Plate IV, fig. 1. 



Shell cylindric-conic, thick, white. Terminal cone short, broadly 

 conic. Nuclear whorls one and three-foui-ths, well rounded, veiy 

 finely granulose. The four whorls of the terminal cone are well 

 rounded and crossed bj^ many quite regular and regularly spaced 

 oblique riblets, whorls of the C3dindric portion of the spire are 

 almost flattened and marked by ill-defined, irregular indications of 

 oblique riblets. On the last half of the last whorl the riblets again 

 assume a stronger character, but are not as regular as on the ter- 

 minal cone. Periphery of the last whorl obsoletely angulated. Base 

 well rounded, crossed by the ill-defined riblets which extend into the 

 minute umbilical perforation. The last whorl is very shortl}- free 

 and quite strongly angulated in the posterior lateral angle. Aperture 

 broadly pyriform; peristome expanded, but not revolute, somewhat 

 thickened, white. Internal pillar moderatel}' large, of uniform diame- 

 ter throughout the C3dindrical portion, somewhat narrower in the last 

 turn, marked by a low submedian fold, which becomes sublamellar in 

 the antepenultimate and penultimate turn and disappears altogether 

 before reaching the aperture. 



There are 22 specimens in the collection of the U. S. National 

 Museum, Cat. No. 187793. They were collected by E. W. Nelson 

 and E. A. Goldman, at Tamazulapan, Oaxaca, Mexico. 



The following table gives a list of measurements: 



