56o NORTH AMERICAN INDEX FOSSILS, 



Eucalyptocrinus elrodi^ lateral and basal views of a characteristic 

 specimen. (After Hall.) 



Basal concavity small and shallow for the genus. Plates of 

 dorsal cup, arms and outer edges of the partition walls marked by 

 numerous nodes often confluent, forming transverse and longi- 

 tudinal ridges. 



Niagaran of Indiana and Illinois. 



185. E. magnus Worthen. Siluric. 

 Large. Dorsal cup rapidly spreading from the base and with 



width greatly exceeding length. Plates flat and smooth or finely 

 granulose. 



Niagaran of Tennessee. 



186. E. tuberculatus Miller and Dyer. Siluric. 

 Resembles E. elrodi in general form, but dorsal cup higher, its 



height nearly equalling its width and plates somewhat elevated 

 and covered by numerous tubercles of various sizes. 

 Niagaran of New York, Indiana and Wisconsin. 



LXVIII. Callicrinus d'Orbigny. 

 In form of calyx and arrangement of plates similar to Eucalyp- 

 tocrinus, but partition walls, instead of forming closed compart- 

 ments to the full height of the arms, rise only to a certain height 

 (about one third of the length of arms) and are not closed above. 

 Plates strongly nodose or spinose. Siluric. 



187. C. longispinus Weller. Siluric. 

 Each R and first interbrachial plate produced into an enormous 



spine, whose length exceeds the width of the dorsal cup. 

 Niagaran of Illinois. 



