120 



PROCEEDINGS OF THE ACADEMY OF 



[1899, 



A NEW AMERICAN LAND SHELL. 



BY EDWARD G. VANATTA. 



Pristiloma pilsbryi, n. sp. 



' Shell imperforate, translucent, light horn colored, polished; suture 

 spire depressed, composed of five and one-half slowly in- 

 creasing whorls; the first two whorls are smooth,, 

 the remainder are deeply radially sulcate, the 

 sulci fading out at the periphery, making the 

 top of the whorls flatly nodulose. There are 

 ahout fifty-two nodules on the last whorl. Base 

 smooth, squarely convex, giving the shell the 

 form of a thick rounded disc. Mouth narrowly 

 lunate. Lip sharp, rather sinuous at the base^ 

 with a slight callus near the columella as in 

 Pristiloma stearnsi ; columellar lip slightly 

 reflexed. 



Alt., 1.68; greatest diam. , 2.56; least diam., 

 2.4 mm. Portland, Oregon. Collected by H. 

 Hemphill. Acad. Nat. Sciences, No. 56,996. 



The sculpture of the spire of this species is 

 very much hke Macroclamys diadema Dall. It 

 Fig. 1. is distinguished from Pristiloma stearnsi Bid. 



by the very much deeper and more separated sulci, and the lower 



spire. 



