96 PROCEEDINGS OF THE CALIFORNIA 



Subn^enus LI31N0PHYSA Fitz. Spire gradually tapering, whorlg 

 rounded, the last less swollen, often umbilicate. 

 ^ 1. Columellar lip strougrly twisted, appressed, nearly hiding umbilicus. 

 f Diameter uot over half of length. Outline sublanceolate. 

 X Malleated. (Varieties often smooth.) 



3 el odes Say. Wh. 6-7, mouth about half of total length ; diam. 0.50- 

 0.60, alt. 1.00 to 1.35. 



Yar. -proxima Lea. Wh. 6-7, mouth .40 of length ; diam. *0.30-0.40, 



alt. *0.75-0.95. 

 Var. Traskii Tryon. Wh. 6, mouth and whorls more rounded, umbil. 



larger ; diam. *0.32, alt. *0.64. 

 J I Minute revolving grooves, chiefly on body-whorl, or smooth. 



4 umbrosa Sny. Wh. 6-7, mouth .45 of length, lip widely expanded ;• 

 diam. *0.45-*0.60, alt. 1.30-1.55. 



Var. Rowellii Tryon. Wh. 6, more slender and delicate, lip not Ex- 

 panded • diam. *0.40, alt. *1.00. 



5 Nuttaliana Lea. Wh. 6, mouth .55 of length, whorls swollen ; diam. 

 *0.35-0.65, alt. *0.7.5-1.25. 



Var. Sumassi Baird. Broader ; diam. *0.40-*0.50, alt. *0.75-*1.12. 



6 Tryoniana iea. Wh. 5, mCuth .45 of length, grooves obsolete; diam. 

 *0.25-0.35, alt. *0.55-0.70. 



7 desidiosa Say. Wh. 5, mouth .55 of length, grooves strong, spire 

 slender ; diam. 0.10-0.30, alt. 0.25-*0.70. 



8 obrussa Say. Wh. 5, mouth .55 of length, grooves obsolete, spire 

 short; diam. *0.20-0.35, alt. 0.45-0.60. 



^ 2. Columellar lip little twisted, flattened, uot appressed, usually leaving 

 umbilicus open. Outline subovate. 

 t f Diameter usually more than half of length. Grooves variable. 

 9- Adelinse Tryon. Wh. 5, mouth nearly .60 of length, umbil. open; 

 diam *0.34, alt. *0.56. 



Var. Gahhii Tryon, Wh. 5-6}^, mouth similar, umbil. usually closed ; 

 diam. *0.28-0.45, alt. *0.62-0.95. 

 Q. 10 Binneyi Tryon. Wh. 5-6, mouth .68 of length, spire short ; diam. 

 *0.52, alt. *0.76. 



11 bulimoides Lea. Wh. 5, mouth .55 of length, spire obtuse; diam.- 

 *0.22-0.30, alt. 0.38-0.45. 



Q? Var. solida Lea. Wh. 5, thicker; diam. *0.25, alt. *0.40. 

 •Q? Var. apicina Lea. Wh. 4, spire short; diam. 0.30, alt. 0.40. 



12 humilis Say. Wh. 5-6, mouth half of length, spire acute; diam. 

 *0.20, alt. *0.35. 



Var. exigua Lea. Wh. 5, more slender ; diam. *0.15, alt. *0.35. 

 Var. ferruginea Hald. Wh. 4-5, umbil. more or less covered ; diam. 

 *0.15, alt. *0.35. 



Genus PHTSA Drap. Shell oblong, sinistral, thin, spiral, aperture 

 sub-oval, columella twisted. 



*• -• ■*. 



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