[ 68 ] . 

 1. Polymita Tryonii, Newcomb. 



Plate 6, figure 3. 



Solid, depress! J globose; spire snbturbinate, obtuse, suture 

 well impressed ; whorls 6, convex, with numerous minute re- 

 volvin.rr lines; aperture rounded, lip scarce) j expanded, thick- 

 ened within; columella diagonal, with one or two obsolete 

 tooth-like prominences; umbilicus narrow, covered. Ashy 

 sky-blue above, mottled by streaks of brown, yellowish-white 

 below, an indistinct brown band on the periphery. 



Diam. 25, height 19 mill. Coll.'^.a-'^- 



Santa Barbara and San Nicholas Isles, Cal. 



Fa?-. Superior whorls with white transverse undulating 

 lines. 



2. Polymita intercisa, Wm. G. Binney. 



Plate 6, figure 4. 



Solid, globose-depressed ; spire conic ; whorls 5, slightly 

 rounded, closely deeply striate, crossed by deep revolving lines ; 

 aperture obliquely lunar, lip heavy, thickened, dirty white, 

 the extremities connected by a heavy ash-colored callus; um- 

 bilicus covered by the lip, which internally at the base is fur- 

 nished with a tooth like process or elevation. Grayish-yellow, 

 with an obscure brown band.' 



Diam. 22, height 15 mill. G;l);% Ja.-^- 



Oregon. 



3. Polymita areolata, Sowerby. 



Plate 6, figure 5. 



Globose-conic, thin, striate ; spire depressed-conoidal; whorls 

 5, a little convex, the last slightly descending towards the 

 aperture, large, inflated ; aperture rounded lunate, lip thicken* 

 ed within, columellar margin sometimes somewhat dentate, 

 nearly covering the narroVv umbilicus; ^base convex. Cream- 

 color, ornamented with revolving series of interrupted brown 

 lines, light brownish or reddish within. 



Diam. 26, height 18 mill. 



Oregon, California. ' -"'rli.-" ^.'"l. 



