iPLATE XXXI. 



Cassidulus subquadratus Conrad (page 70). 



Fig. la. Upper surface of the test. 

 1ft. Lower surface of the test. 

 Ic. Lateral view of the same. 

 Id. Posterior view of the same. 



le. Lower portion of the petaloidal region of the right antero-lateral ambu- 

 lacrum. 

 If. Several plates of the same, much enlarged. 

 1^. Oral portion, much enlarged. 

 \h. Apical disk, enlarged. 



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