PLATE XLV. 



Hemiaster parastatus (Morton) (page 83). 



Fig. la. Upper surface of the test. 

 lb. Lower surface of the test. 

 Ic. Lateral view of the same. 

 Id. Posterior view of the same. 

 le. Anterior ambulacrum, enlarged. 



If. Portion of petaloidal region of the same, highly magnified. 

 Ig. Portion of basal region, ditto. 



Ih. Several plates from the petaloidal region of the right antero-lateral ambu- 

 lacrum, much enlarged, 

 li. Three interamlmlacral plates, with fasciole. 

 Ik. Portion of fasciole, highly magnified. 

 11. Tubercle from the side. 

 Iwi. Ditto from above. 

 In. Apical disk, enlarged. 

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