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 2. Drymseus Mexicanus, Lamarck. 



Plate 13, figure 5. 



Ovately acuminate, narrowly umbilicate, thin, pellucid, with 

 thin incremental strise. White with two brown zones on the 

 last whorl, and maculations of the same color on the others. 



Length 28 mill. 



Cinaloa, North-western Mexico. 



LIOSTRACUS, Albers. 

 1. Liostracus Ziegleri, Efeiffer. 



Plate 13, figure 6. 



Shell ovate-conical, narrowly perforate, slightly striate, de- 

 cussated by nearly obsolete spiral lines; spire conical, acute; 

 whorls 6, slightly convex, the last subangulate in the middle; 

 aperture oval, the lip simple, slightly reflexed on the columellar 

 margin, columella scarcely receding. White, sometimes with 

 chestnut ban is, and interruptedly maculate upon the spire. 



Length 21, diam. 10 mill. 



Cinaloa, North-western Mexico. 



2. Liostracus Floridanus, Pfeiffer. 



Plate 13, figure 7. 



Ovately turrited, perforate, rather smooth, hyaline with white 

 opaque lines and maculations ; spire elongate, acute ; whorls 6|, 

 slightly convex, the last scarcely one-half of the total length of 

 the shell, subangulate below the middle, and attenuated at the 

 base ; aperture oval, oblique, columella receding, a little twisted, 

 columellar margin of the lip expanded and reflected. Inter- 

 ruptedly fasciate with brown. 



Length 16, diam. 8 mill. 



Florida. 



