ECHINODERMATA—CRINOIDEA. 



513 



49. E. mooresi (Whitfield). (Fig. 1828, h-f.) Carbonic. 

 Smaller than E. tuberculatus, without the tubercles. Costals 



large and spine-bearing; spines bulbous below. 



West Virginia (Lower 

 Cambridge limestone) and 

 Ohio. 



50. E. tuberculatus Meek and 



Worthen. (Fig. 1829.) 

 Carbonic. 

 Large. Whole external sur- 

 face covered with regularly 

 arranged tubercles. 

 Carbonic of Illinois. 



XXL Ceriocrinus White. 

 Dorsal cup as in Eupachy- 

 crinus, but the posterior B 

 more elongate than the others 

 and supporting a small IRA. 

 Radianal wanting. Costals 

 one or two, the lower fre- 

 quently extended into a spine. Arms 10, short and heavy 



51. C. hemisphericus (Shumard). (Fig. 1830.) 

 Calyx small, smooth, basin-shaped. 



Carbonic of Missouri, Illinois, Kansas, 

 Iowa and Nebraska. 

 52. C. inflexus (Geinitz). Carbonic. 



Basin-shaped, deeply impressed below. 

 Height of calyx about two fifths of an inch; 

 diameter at top nearly one inch. Surface 

 smooth. 

 Fig 18^0 Ceriocri- Carbonic of Nebraska, Oklahoma and Utah. 



nus hemisphericus. (111. 



^^''^•) XXII. Erisocrinus Meek and Worthen. 



Differs from Eupachycrinus in the absence of both IRA and 



radianal. IB 5, minute, covered by the stem. Mississippic- 

 Carbonic. 



Fig. 1829. Eupachycrinus tuberculatus^ 

 lateral and basal view of calyx. (After 

 Meek and Worthen, 111, Geol., V.) 



Carbonic. 

 Carbonic. 



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