THE NAUTILUS&VS 



VOL.. XII. DECEMBER, 1898. No. 8. 



DESCRIPTIONS OF NEW SPECIES AND VARIETIES OF AMERICAN 

 ZONITIDTE AND ENDODONTIDJE. 



IJY HENRY A. PFLSRRY. 



Pyramidula Cockerelli n. sj>. 



Shell having the general shape of P. striatella ; thin, greenish, 

 more or less streaked and dotted with light yellow ; a little shining, 

 very irregularly wriukle-striate, some specimens unequally ribbed 

 in places above and at the margin of the umbilicus. Spire convex, 

 the first whorl a little protruding. Whorls 4|, the first whitish- 

 corneous and glabrous when unworn, the rest convex, regularly 

 widening, separated by a deep suture ; last whorl obtusely angular 

 at the periphery in front, becoming rounded on its later portion ; 

 base well rounded, the umbilicus showing all the whorls, its width 

 contained about 3.7 times in that of the shell. Aperture oblique, 

 rounded, the penultimate whorl cutting out a segment of about one- 

 fourth the whole circle of the thin and simple peristome; the 

 greatest diameter of aperture contained about 2.4 times in that of 

 the shell. 



Alt. 2.8, diam. 5.5 mm. (specimen from New Mexico). 



Alt. 3.2, diam. 6.5 mm. (specimen from Colorado). 



This species is based upon a series of shells from Labelle, Taos 

 County, New Mexico, collected by Rev. E. H. Ashmun, and speci- 

 mens from Custer and Saguache Counties, Colorado, collected by 

 Prof. T. D. A. Cockerell. It is what has been very generally 

 known as Pat n la Crohkhitei Newc. ; but reference to co-types of 



