﻿74 SMITHSONIAN MISCELLANEOUS COLLECTIONS [VOL. 47 



DOLATOCRINUS GREENEI Miller and Gurley 



1894. Miller and Gurley, 111. State Museum of Nat. Hist., Bull. 4, p. 28, 

 pi. 111, figs. 10, 11, 1 J. 



The original description of Dolatocrinus grccnci mentions the 

 occurrence, in two of the interradial areas, of two plates in the first 

 row of interbrachials. These could not be made out with certainty 

 in any of the specimens examined, but a specimen from Louisville, 

 Kentucky, has one interradial area much wider than the others and 

 wide enough for two plates. Another specimen referred to D. grccnci 

 agrees with the description and figure of that species except that the 

 interradial areas are alike in possessing but one first interbrachial. 

 There is also, as noted above, a slight difference in the grouping of 

 the arms with reference to the anterior ray. The occurrence of 

 additional interbrachials in the type may be abnormal, as suggested 

 by the authors of the species. 



Formation and locality. — Hamilton (?): Louisville, Ky., and 

 Charlestown, Ind. Apparently also in the Onondaga near Dublin, 

 Ohio. 



Cat. No. 35,139 and 43,108 (Ulrich collection) U. S. N. M. Also 

 in Massachusetts Institute of Technology, No. 655. 



DOLATOCRINUS CHARLESTOWNENSIS Miller and Gurley 

 1896. Miller and Gurley, 111. State Museum Nat. Hist., Bull. 8, p. 44, 

 pi. in, figs. 10, 11, 12. 



A specimen lacking the surface ornament, hence with some doubt 

 referred to D. chart est ozmiensis Miller and Gurley, apparently differs 

 from it only in having two instead of three arms in one of the 

 rays. Another specimen in the collection of the Massachusetts 

 Institute of Technology shows the characteristic features of the 

 species. 



Formation and locality. — Hamilton: Thedford, Ontario, and 

 Charlestown, Ind. 



Cat. No. 26,466 U. S. N. M. Also No. 652 Massachusetts Insti- 

 tute of Technology. 



DOLATOCRINUS TRIADACTYLUS Barris 



1884. Barris, Proc. Davenp. Acad. Nat. Sci., iv, p. 100, pi. 11, figs. 



5, 6, 7. 

 1896. Dolatocrinus aplatus .Miller and GURLEY, 111. State Museum Nat. 



Hist.. Bull. 8, p. 48, pl. ni, figs. 16, 17, 18. 



This species is represented in the National Museum collection by 

 several well-preserved specimens. A comparison of the figures and 



