224 CRINOIDS. 



Taxocrinus shumardianus (Hall). 



Forbesiocrinus shumardianus Hall, 1858: Geology Iowa, vol. I, p. 671, pi. 



xvii,fig. 1. 

 Taxocrinus shwnardianus WachBxnuth & Springer, 1879: Proc Acad. Nat. 



Sci.,Phila. (Revision, p. 49.) 



This species differs from T. giddingei in bein^ stouter, and 

 in having relatively much shorter arms. 



Horizon andlocalities — Lower Carboniferous, Saint Louis 

 limestone : Saint Louis. 



Forbesiocrinus agassizi Hall. 



Plate XXX, fig. 3. 



Forhesiocriniis agassizi Hall, 1858: Geology Iowa, vol. I, p. 631. 

 Forbesiocrinus agassizi Hall, 1860: Geology lowa, vol. I, Hupp., p. 65. 

 Forbesiocrinus agassizi, \&r. gigatiteus Meek & Worthen, 1868: Geol. Sur. 



Illinois, vol. Ill, p. 495, pi. xviii, fig. 3. 



Calyx large, composed of large, convex, smooth plates. 

 Arms long, slender, infolded at the ends for a considerable 

 distance. Interradials numerous. Anal interradials scarcely 

 different from the others. 



Horizon and localities — Lower Carboniferous, Burlington 

 limestone: Burlington (Iowa). 



Forbesiocrinus wortheni Hall. 



Forbesiocrinus woriheni HaW, 1858: Geology Iowa, vol. I, p. 632, pi. xvii, 

 fig. 5. 



Somewhat smaller than F. agassizi, and with the interradial 

 areas more depressed. 



Sorizon and localities. — Lower Carboniferous, Keokuk 

 limestone : Keokuk ( Iowa ), Bonaparte ( Iowa ). 



Onychocrinus monroensis (Meek & Worthen). 

 Plate XXX. fig. 2. 



Forbesiocrinus'monroensis'iA.eek ScWorVaen, 1861: Proc. Acad. Nat. Sci., 



Phila. p. 130. 

 Onychocrinus monroensis Meek & Worthen, 1866: Geol. Sur^ Illinois, vol. 



II, p. 244, pi. XVII, fig. 7. 



Crown rather below medium size, prominently divided into 

 five rays. Infrabasals scarcely visible beyond the margin of 

 the column. Basals five, the posterior truncated on the upper 



