PLATE XLIII. 



Hemiaster elegans Shumai'd (p. 88). 



U. S. Nat. Mus. 21887. 

 Figure la. Lower portion of the test. 



lb. Middle portion of the petaloidal region of the anterior ambulacrum, X 5. 



lc. Same, left anterolateral ambulacrum, X 5. 



Id. Two interambulacral plates, X 3. 



le. Apical system, X 5. 



If. Upper portion of the anterior ambulacrum, X 3. 



Hemiaster whitei Clark (p. 89). 



IT. S. Nat. Mus. 9732 type. 

 Figure 2a. Upper surface of the test. 



2b. Posterior surface of the test. 

 2c. Lateral surface of the test. 

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