NO. 1483. 



UROCOPTID MOLL USKS—BARTSCH. 



123 



parent, marked by a narrow spiral lamella, which is pendant almost 

 from the middle of the roof of the whorls and extends throughout 

 the entire spire. In the three whorls preceding the penultimate 

 whorl this lamella is furnished with slender, forward-slanting- teeth, 

 the whole, in this part, resembling the blade of a narrow saw. There 

 are two specimens of this species in the U. S. National Museum 

 collection. Cat. No. 187504, and one in the Academy of Natural 

 Science, "Philadelphia, all collected by E. W. Nelson in the Sierra 

 Guadelupe, Coahnila, Mexico. 



Measurements of Epirobia (Propilsbrya) nelsoni. 



« Type. 



The second specimen has the strong fold on the pillar, extending 

 over the four whorls preceding the penultimate. 



HOLOSPIRA (HOLOSPIRA) GOLDFUSSI Menke. 



and 



HOLOSPIRA (HOLOSPIRA) GOLDFUSSI ANACACHENSIS, new 



subspecies. 



Plate IV, fig. 4. 



The members of this species in our collection group themselves about 

 two centers of distribution. One of these centers, that of the typical 

 form, is New Braunfels; the other has its center in the Anacacha 

 Mountains. The two forms agree quite well in size, as is shown in 

 the accompanjdng table of measurements. The western form has a 

 lesser number and much more strongly developed ribs than typical 

 goldfussl (see table), and may be known as Holospira {Holosjnra) 

 goldfussi anacachensis (see table). 



