558 



NORTH AMERICAN INDEX FOSSILS. 



by a vertical suture; each pair of these supports one of the lo 

 vertical partitions, the other five of which are supported by the 

 single interdistichals. Tegmen elongate ; upper part extended to 

 form a tube which projects about the arms; 

 composed of four ranges of plates of which 

 the two middle ones are the least regular 

 in their arrangement and the upper one 

 closes the center. Attached to the outer 

 walls of the tegmen and extending to its 

 top are ten partitions which form deep 

 vertical compartments for the reception of 

 two arms each. Arms 20, biserial, com- 

 posed of very narrow pieces. Anus at end of a tube. Column 

 round (Fig. 1891). Siluric. 

 180. E. milligani Miller and Gurley. (Fig. 1892.) Siluric. 



Fig. 1 89 1. Eucalyptocrv 

 nus. (After Weller. ) 



Fig. 1892. Eucalyptocrinus milliganiy 

 basal and lateral views. (After Miller and Fig. 1893. Eucalyptocrinus coelatus, 

 Gurley.) v^x. levis. (After Hall.) 



Distinguished by the sudden expansion at the base of the arms. 

 Niagaran of Tennessee. 



