PLATE XXVI. 



EcHiNOBRissus EXPANSUS Clark (page 61). 



Fig. la. Upper surface of the test. 

 \b. Lower surface of the test. 

 Ic. Side view of the same. 

 Id. Posterior view, showing anal sulcus, 

 le. An iuterauibulacral plate, enlarged. 



If. Portion of the petaloidal region of the right anterolateral ambulacral area. 

 l(j. Apical disk, enlarged. 



ECHINOBRISSUS TKXANUS Clark (page 62). 



Fig. 2a. Upper surface of the test. 

 26. Lower surface of the test. 

 2c. Side view of the same. 

 2d. Posterior view, showing anal sulcus. 

 2e. Portion of the right antero-lateral ambulacrum. 

 2/. Four iuterambulacral plates, highly maguilied. 



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