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ACIONA. 
Baccinum, Rumphii. 
Turzo, Linn., &c. 
Scavaria, Lamarck. 
Scauarus, De Montford. 
CHARACTER GENERICUS. 
Testa libera, univalvis, conica, spira elevata, regularis ; an- 
fractus teretes, distincti, distantes transversim costati ; 
columella nulla; os rotundatum, integrum, perfectum, 
marginatum. 
ANIMAL incognitum. 
WEN DELTRAP. 
GENERIC CHARACTER. 
Shell free, univalve, conic, with a regular elevated spire ; 
whirls round, distinct, distant and transversely ribbed ; 
pillar none; mouth rounded, entire, perfect, and mar- 
gined. 
ANIMAL unknown. 
The absence of the columella or pillar, will warrant the 
liberty I have taken in dividing this genus from scalaria of 
Lamarck. Of the animal nothing is known; but it is pro- 
bably totally distinct from that of the genuine genus scala- 
ri@, which is admirably figured in Planc’s work on the rarer 
shells of the Adriatic. 
Of the genus aciona there are probably more than one 
species; that from China being different in form and 
thickness from the Amboina one. 
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