Sharp posterior ridge usually with low ridges on posterior slope. Historically widespread but uncommon. Yellow, green or brown shell with interrupted green rays. Posterior ridge sharp. Pronounced ridges on posterior slope and posterior part of disc.
Historic record shows sporadic and rare distribution.
No live records in recent decades. Brown or black, very heavy shell. Beaks prominent and curved toward the anterior margin. Elongate, inflated yellow shell. Greenish bars may be visible.