THE 
AGATE: BULL A. 
—————— EAR 
GENERIC CHARACTER. 
Animal refembling a Limax or Slug. 
Shell univalve, convoluted. 
Aperture fomewhat ftraitened, oblong, longitu- 
dinal, entire at the bafe. 
Column oblique and {mooth. 
SPECIFIC CHARACTER, Sc. 
Ovate, pointed, wide-mouthed BULLA, with 
broad fafcie, crimfon mouth, and truncated 
column. 
The AGATE BULLA. 
The CRIMSON-MOUTHED BULLA. 
This moft elegant fhell is a native of America and 
the Weft Indian iflands. It varies confiderably in 
point of color, being fometimes of a dufky brown, 
with deeper variegations; at other times ornamented 
with the beautiful hues reprefented on the annexed 
| plate. This is commonly called the purple-mouthed 
variety. 
