12 



BOOK OF SPECIES. 



sions elongated, arcuated and transverse, situ- 

 ated under the posterior margin, 

 P. UNGARiCA. Conical^ finely striated lon- 

 gitudinally, and somewhat wrinkled transversely ; 

 summit recurved and spiral ; base roundish, from 

 one inch to two in diameter, often coated with a 

 brow^n shaggy epidermis ; inside white or pinkish. 

 B. large. W. 37- 41. 



P. MiTRULA. Roundish ovate, obliquely coni- 

 cal, solid, whitish, with concentric imbricated 

 wrinkles ; summit slightly recurved ; small. B. 

 W. 37. 43. 



P. INTORTA. Ovate-roundish, peculiarly ob- 

 liquely conical, white, with obsolete longitudinal 

 striae ; summit lateral, exserted, and spirally 

 twisted ; small. 



CALYPTREA. 



Conical; base orbicular, and summit vertical, im- 

 perforate, and acute; internal cavity with a 

 spiral septum. 



C. EXTiNCTORiuM. Sub-orbicular, conical, 

 whitish, and rather smooth, with unequal spiral 

 circles; summit sub-acute. 1. W S. 8. 5. 



C. LEV iG ATA. Orbicular-depressed, nearly 



