PLATE L. 



LiNTHiA TUMiDULA Claik (page 91). 



Fig. la. Upper surface of the test. 

 Ih. Lower surface of the same. 

 le. Lateral Tiew of the same. 

 Id. Posterior view of the same. 



le. Tipper jiortiou of the anterior ambulacrum, euhirged. 



1/. Several plates from tlie petaloidal region of the left postero-lateral ambu- 

 lacrum, highly niagniiied. 

 Ig. Apical disk, enlarged. 



l/i. Tubercle from the side, highly magnified, 

 li. Ditto, from above. 

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