EXPLANATION OF PLATES 



Plate 1 



Earpidiicm inslgnis, new species 



Fig. 1. Median section of an individual showing septa of tlie pedicle and 

 brachial valves, and the relatively enormous spondylium. 



2. Pedicle valve of a medium sized individual. 



3. Side view of a small individual. 



4,5. Side and cardinal views of a small individual showing the deltidlal 

 plates. 

 6. Anterior view of an adult individual of average size. The side view 

 of this same specimen is shown in plate 2, figure 7. 

 6 



