218 



Auricula — continued. 



hordeola. . ovato-conical ; smooth, lip striated within ; colu- 

 mella with one fold. . small. 



acicula. . turreted, subcylindrical, smooth ; columella with one 

 fold. . small. 



ferebellata. . turreted, smooth, opening semiovate ; columella 

 with three folds. . small. 



Volvaria. 



bulloides. . cylindrical, transversely striated ; spire pointed and 

 nearly included. . f inch. 



Ampullaria. 



pygmcea. . ventricose, smooth ; base umbilicated ; aperture long 

 . . very small. 



excavata. . ventricose, smooth ; columella with a sinuous exca- 

 vation. . small. 



conica. . ovato-conical, w^hirls smooth and convex ; umbilicus 

 half covered. . f inch. 



acuta. . ventricose, spire short and pointed ; umbilicus half co- 

 vered. . 1 inch. 



acuminata. . ventricose ; spire long and pointed ; umbilicus co- 

 vered. 



spirata. . subventricose ; wdiirls flat on the top, with an acute 

 border. 



depressa. . globose, turns convex on the upper part ; columella 

 depressed in the lower part. . 1 inch 



canaliculat a. . glohosQ; spire short and canaliculated ; a spiral 

 groove accompanying the umbilicus. . ^ inch. 



patula*. . ventricose ; spire short ; umbilical groove covered 

 over ; lip wide, subauriculated. . If inch. 



sigaretina. . ventricose, imperforate ; spire short, lip large. . 

 1| inch. 



crassatina. . globose, thick, imperforate ; base of the columella 

 spread out ; spire canaliculated. . 3 inches. 



hyhrida. . globose, imperforate ; columella eflfused. . If inch. 



Serpula. 



intorta. . rathei angulated, contortedly agglomerated, plicae 



transverse. 

 cristata. . round, with denticulated ribs ; contorted in a discoidal 



spire, the other end extended. . France. 

 spirulcea. . compressed, smooth ; discoidal spire, fore part 



disjoined, sharp edge. . Bayonne. 

 minima. . capillary, glomerated. . Grignon. 

 echinata. . flexuous, with subspinous ribs. 

 sulcata. . round, subglomerated, straight forward, numerous 



subdentated longitudinal folds. . Touraine. 



* Helix mutabilis — Brand, Foss. No. 51. 



