There was only ever one edition of the Compendium. First it was published by Dutton, then by Abbott himself (as "American Malacologists") and finally by Odyssey publishing. A corrected version was often discussed but never appeared. 
The Japanese version used the same pictures, but the text (including many identifications) was substantially modified and it qualifies as a separate work. 

Paul Callomon
Collection Manager, Malacology, Invertebrate Paleontology and General Invertebrates
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Academy of Natural Sciences of Drexel University, Philadelphia
[log in to unmask] Tel 215-405-5096 - Fax 215-299-1170

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From: Conchologists List [[log in to unmask]] on behalf of Douglas Stemke [[log in to unmask]]
Sent: Monday, April 24, 2017 9:31 PM
To: [log in to unmask]
Subject: [CONCH-L] Compendium of Seashells, how different are the new editions?

Hello All.

My general reference that I use for 'popular' shells is the first edition, 1983.  How much were the newer editions updated or were they just new printings? Is it worth updating?

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