NO. 14S3. 



UROCOPTID MOLL USKS—BARTSCH. 



151 



spire, and continue into the perforation. Last whorl free at its anterior 

 extremity for about li mm., the free portion marked by rings of rib- 

 lets, which become crowded behind the peristome. Free portion of 

 the parietal wall somewhat sinuous. Junction of the parietal and 

 outer wall slightly obtusely angulated. Aperture moderately large, 

 brown within, semioval, the short diameter of the oval being repre- 

 sented by the parietal wall. Peristome decided^ expanded, and some- 

 what reflected, edged with white. Internal column very large, about 

 one-half the greatest diameter of the shell in its widest part, widest 

 near the terminal cone, tapering gradually anteriorly. In the penul- 

 timate whorl it is only about one-half as wide as it is at the junction 

 of the cylindrical portion of the spire with the terminal one. In the 

 last whorl it is much narrower and smooth. The column is thin, semi- 

 transparent, marked by thread-like riblets, which extend from the 

 roof of the whorls to the floor. There are about twenty-four of these 

 riblets in the penultimate and thirty-two in the twelfth whorl. In 

 addition to the riblets the column has a weak spiral fold, which is situ- 

 ated a little above the floor. There is also a tendency to form nodules 

 at the place where the riblets cross this fold. 



There are two specimens of this species in the collection of the 

 U. S. National Museum, Cat. No. 188180. They were donated by Prof. 

 A. L. Herrera, and come from Siiaca Yoapan, Oaxaca, Mexico. 



Measurements of HoJospir a {Ckdosternma) herrerse. 



a Type. 

 STALACTELLA, new subgenus. 



Jlolospira having a spiral swelling on the pillar, w^hich terminates 

 anteriorly in a strong lamella; and a spiral line of slender teeth pend- 

 ing from the parietal wall in the anterior volutions. 



Tyjje. — Holosplra {Stalactella) rose!^ new species. 



HOLOSPIRA (STALACTELLA) ROSEI, new species. 

 Plate IV, fig. 10. 



Shell cylindric-conic, white. Nuclear whorls two, more inflated 

 than the succeeding ones, minutely granulose. Terminal cone long, 

 gently tapering, with the whorls well rounded. Whorls of the cylin- 

 drical portion flattened, shouldered a little below the summit and 



