136 CLARK. 



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2. Heilprin, Angelo. The Bermuda Islands. Chap. VII, pp. 

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3. Ludwig, Hubert. Beitrage zur Kenntniss der Holothurien. 

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4. bstergren, Hjalmar. Das System der Synaptiden. Ofr. of 

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5. Theel, Hjalmar. Report on the Holothuroidea. Pt. 2. 

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