38 THE NAUTILUS. 



stone hills. Probably the snails we found are a fair sample 

 of the fauna of all this country. 



Zonit aides minuscula alachuana (Ball). One specimen. 



Vallonia cyclophorella Ancey. Very abundant. 



Vallonia gracilicosta Reinh. Much less common. 



Pupilla muscorum xerobia, Pils. Moderately abundant. 



Bifidaria pellucida hordeacella (Pils.). Very abundant. 



Bifidaria, pilsbryi Sterki. Two specimens. 



PUPILLA MUSCORUM XEROBIA n. subsp. PL II, figs. 1, 2. 



Shell small, very short, composed of 5Vs whorls, the last 

 three forming the cylindric portion, those above forming a 

 very short, obtuse cone ; last whorl ascending a little, having 

 a stout buff crest behind the thin, well-expanded lip. There 

 is a small, short, parietal lamella but no other teeth. Length 

 2.5, diam. 1.5 mm. 



Types 110. 104005 A. N. S. P. from Duran, N. M. Others 

 of the same lot in collections of L. E. Daniels and J. H. Ferriss. 



Mr. Vauatta looked over the collection of the Academy and 

 reports that he found the same small race from the following 

 localities, all in Colorado. Trinidad, Pilsbry and Ferriss, 

 1906. Magnolia, Boulder Co., 8000 ft., D. McAndrews. 

 Estes Park, E. H. Aslimun. Black Lake Creek, T. D. A. 

 Cockerell. Near Golden, 7000 ft., E. E. Hand. 



The length varies from 2.25 to 2.75 mm. in the lot taken at 

 Duran. 



A NEW FOSSIL VITRINELLA, FROM BOSTON, MASSACHUSETTS. 



BY WILLIAM F. CLAPP. 



Through the kindness of Dr. H. W. Shimer of the 

 Massachusetts Institute of Technology I have been able to 

 examine some of the material he has received from the ex- 

 cavation for the Boylston street subway, Boston, Mass. The 

 results of Dr. Shimer 's investigations concerning the marine 



