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 Dizygocrinus unionensis var. divalis (S. A. Miller) ..... 425 



Fig. 21. Specimen with arms, showing anterior side ; the arms alternately paired. 



22. Side view of the calyx. 



23. Dorsal aspect of a specimen in which all the arms are paired. 



24. Specimen with some of the arms paired. 



(All specimens in the collection of Wachsmuth and Springer, unless other- 

 wise stated.) 



