94 



THE NAUTILUS. 



Margin of Kern River 2 miles north of Bakersfield, Tulare 

 Co., Cal., on an island formed by an irrigation ditch ; on dead 

 vegetation at the water's edge. Collected by Ferries and Hand, 

 July 1, 1916. 



This species differs from all forms of E. mormonum and E. 

 hillebrandi by its much smaller umbilicus, far wider spire, and 

 the more inflated last whorl. The embryonic whorls of the two 

 species mentioned are densely papillose, while the new form 

 has a pattern of close, irregularly radial wrinkles. It is not 

 closely related to any other species known to us. 



Oreoheltx handi n. sp. 



A member of the 0. hemphilli group. The shell is thin, de- 

 pressed, very strongly keeled throughout, irregularly striate, 

 decussated by spiral lines producing a rather indistinct granula- 

 tion. On the other base there are spiral series of granules. In 

 young shells and mostly adults, there are short cuticular pro- 

 cesses on the granules and at the periphery. There are 4J 

 whorls. The first 1£, forming the embryonic shell, are strongly 

 convex, the first whorl almost smooth, after which a few radial 

 ripples appear. The first part, embryonic whorl, is very convex 

 but begins to be impressed near the periphery. Subsequently 

 the whorls are excavated on both sides of the suture, and the 

 last one is concave above and below the peripheral keel. In fact 

 it descended a little below the keel. The umbilicus is rather 

 large and funicular. Aperture rather small, the margins con- 

 verging, thin. There is a band of dark livid brown above and 

 one close below the keel, the rest of the upper surface being 

 clouded or suffused with the same color with lighter patches 

 and streaks ; keel usually whitish. Alt. 5.7, diam. 10.2 mm. 



Charleston Mountain, Lincoln Co., Nevada. This is about 

 30 miles north of Las Vegas, Nevada. Collecting was done for 

 about a mile southward from Griffith's Hotel, the elevation 

 about 9000 to 9500 ft. 



This species is related to O. hemphilli and O. eurekensis, but 

 differs from both by its more depressed, much more strongly 

 keeled form. O. hemphilli is also much larger and more solid. 

 Its locality is about 200 miles northeast from Charleston 



