PLATE XCIX. 



Strongylocentrottjs drobachiensis (Miiller) (p. 216). 



Wagner Free Inst. Sci. 4350. 



Figure la. Upper surface of the test, 

 lb . Lower surface of the test, 

 lc. Lateral surface of the test. 



DlPLOTHECANTHUS DALLI Twitchell, U. sp. (p. 218). 



IT. S. Nat. Mus. 164670. 

 Figure 2a. Posterior surface of the test. 

 2b. Lateral surface of the test. 

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