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EXPLANATION OF PLATE XXI. 



Fig. 1. Campyloprion annectans Eastm. Portion of symphysial dentition, right lateral aspect. Xf . 

 Fig. 2. Edestus minor N. and W. Symphysial dentition, right lateral aspect. Xj. 

 Fig. 3. Edestus minor N. and W. Symphysial dentition, left lateral aspect. X. 



The original of Figure 1 is preserved in the Museum of Comparative Zoology at Cambridge, Mass.; that of 

 Figures 2 and 3 is the property of Amherst College. 



