PLATE XLVII. 



Hemiaster texanus Roemer (page 86). 



Pig. la. Upper surface of the test. 



Ifc. Lower surface of the test. ^ 



Ic. Lateral view of the same. 

 1(7. Posterior view of the same. 



le. Several plates from the petaloidal region of the right postero-lateral ambu- 

 lacrum, highly magnified. 

 If. Ditto, anterior ambulacrum. 

 1^. Apical disk, much enlarged. 

 Ih. Lateral view of a tubercle, highly maguified. 

 li. Same from above. 

 198 



