312 



PALEOZOIC TIME — CARBONIFEROUS AGE. 



(b.) Echinoderms : Crinoids. — Fig. 530, Pentremites pyriformis Say; figs. 531, 

 532, P. Godonii Be France (P.florealis, in part), — both from the Kaskaskia lime- 

 stone ; fig. 523, Poteriocrinus Missouriensis Shumard, from the St. Louis lime- 

 Figs. 523-535. 



Fig. 523, Poteriocrinus Missouriensis ; 524, Actinocrinus proboscidialis ; 525, A. unicornis ; 

 526, Zeacrinus elegans; 527, Actinocrinus Christyi; 528, Platycrinus Saffordi; 529, the 

 proboscis of Actinocrinus longirostris ; 530, Pentremites pyriformis ; 531, 532, P. Godonii 

 (florealis) ; 533, Archaeocidaris Wortneni ; 534, 534 a, A. Shumardana ; 535, A. Norwoodi. 



stone j fig. 524, Actinocrinus proboscidialis H. ; fig. 525, A. unicornis Owen & 

 Shumard ; fig. 526, Zeacrinus elegans H., — this and the two preceding from 

 the Burlington limestone.; fig. 527, Actinocrinus Christyi Shumard, the arms 

 fallen off, — from the Encrinal limestone of Missouri; fig. 529, proboscis of 

 Actinocrinus loncjirostris H. ; fig. 528, Platycrinus Saffordi Troost, side-view, 

 from Burlington. Most of the above Crinoids have lost their arms and 

 pedicels. 



Echinoids. — Fig. 533, Archseocidaris Wortheni H., of the St. Louis lime- 

 stone; fig. 534, A. Shumardana H., of the Warsaw limestone, — a spine, 



