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INTRODUCTION. 
by purchase, important additions to the collection of these Echinoderms. 
The present list, therefore, has come into being as a much-needed Supple¬ 
ment to the well-known Catalogue. Without the labours of Etheridge 
and Carpenter, its compilation would scarcely have been possible. 
Restored figure of Orophocrinus fusiformis, Wachs. & Spr., a Blastoid from the 
Carboniferous (Kinderhook) of Iowa, U.S.A. Introduced to show the main parts 
of the typical Blastoid skeleton. 
In consequence of the facts just detailed, it has been thought well 
to state shortly the nature of the various specimens. The terms used 
may here be explained. The Blastoid skeleton consists of three main 
