108 rnirusitu of Califoniia Pithlivntidii.s in Zoologij \Vo\.. 16 



quiiifimc'ially arranged, so that they apjiear ranked in iibliiiue as well 

 as spiral series, but on the later whorls the number of tubercles in- 

 creases so rapidly and irregularly that the oblique arrangement is soon 

 lost, the lines of growth at the same time becoming more prominent, 

 and the fine underlying granulation less distinct or even obsolete; 

 sculpture of penultimate whorl transitional toward that of the last 

 whorl, where the tubercles have given way to a series of rather weakly 

 incised spiral lines, more or less interrupted where they cross the lines 

 of growth, and becoming obsolete below the shoulder. 



Spire varying from very depressed to low conic ; whorls convex, 

 the last whorl descending in front. Aperture ample and very oblique. 

 Edges of peristome somewhat converging and connected by a very thin, 

 transparent, parietal callus. 



On the penultimate whorl a rather high power reveals in certain 

 lights a number of exceedingly delicate, sharp, distantly .spaced, 

 oblique, incised lines, intersecting the lines of growth almost at right 

 angles. 



Greater diameter of shell, 29.5 nnn. ; lesser diameter, 23 nun. ; height 

 from umbilicus to apex, 13 mm. 



Type. — Cat. no. 3480 of the writer's collection; pai-a types in the 

 collections of the University of California, and the private collection 

 of llv. Allyn G. Smith. 



Ttipe Localiiij. — A rocky talus slojn- on the southeast wall of Mill 

 Creek Canon, San IScrnardino xMounlains. California, near the old 

 road, about l\'-> miles from the canon nioutl:. altitude about 3250 feet: 

 ten dead shells, A. G. Smith and S. S. Herry. Jan. 7, 1!)14; three living 

 specimens, A. G. Smith. May 12. 11)14; one living specimen. S. S. 

 Berry, April 8, 1!)15. 



Remarks. — This fine helicoid, one of the largest of the southern 

 fauna, is distinguished by the aforementioned characters from all others 

 known to me. It perhaps resembles a very large and extremely 

 flattened form of E. traski more than any of the other Californian 

 speci&s, and I believe the two species to be rather nearly allied, though 

 the situations in w-hieh they are respectively to be found are very 

 dissimilar. E. prtricola was first discovered while quarrying through 

 a rocky slide in the possible hope of obtaining Micrarionta or Sonorella, 

 genera as yet unknown from the San Bernardino Range. The species 

 does not seem to be an abundant one, and several hours' arduous labor 

 in turning over large blocks of stone and clearing out the detritus, 



