PLATE Va. 
Hotopus ranat, d’Orbigny. 
Diam 
Wig. 1. Ventral aspect of a decalcified arm, showing the ambulacral 
groove and one of its lateral branches, : ; Se Se NG 
Fig. 2. Side view of a decalcified arm, . ; , : ASU 
Fig. 3. Side view of an entire ray, ; : ; = Date 
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