12 



Bulletin 23 



36 



PLATE 6 



Fig. 1. Melocrinus {Trichotociinus) harrisi n .sub-gen. and sp. 

 Dorsal aspect of calyx. 



2. Ventral view showing trichotomous branching. 



3. Melocrinus williamsi, n. sp 



Dorsal view, showing a portion of the anal tube. 



4. Mariacrinus showing uniserial arms. 



5. Melocrinus showing biserial arms. Fig's 4 and 5 are 



from Wachsmuth and Springer. 



6. Trichotocrinus showing branches of its biserial arms 



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