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Sand Dollar, Echinarachnius parma, Gray.
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Echinorachnius parma, the sand-dollar..
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Echinarachnius parma, aboral view with spines (58); oral view with spines (59); aboral view wihout spines (60); oral view without spines (61); young specimens wihout spines to show form of test and position of anal opening (62); Mellita pentapora, aboral view with spines (63); oral view with spines (64).
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