This book is the second volume of two books about sea urchins
(echinoids) since 1953 (Th. Mortensen). The detailed and coloured
illustrated descriptions enable the reader to identify all species
living today in our oceans. Recent scientific searchings are
included. Volume II. describes the Irregularia with bilateral
symmetry, including the well known "sand dollars" and "heart
urchins", living mostly more or less deeply burrowed in the
substrat.
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