OEINOIDS. 171 



Dorycrinus parvus (Shumard). 



Aciinocnnus parvus Shutnard, 1855: Geol. Sur. Missouri, Ann. Rep., p. 



193, pi. A, flg. 9. 

 Actinocrimcs trinodus Hall, 1858: Geol. Iowa, vol. 1, p. 575. 

 Aeiinocrmus symmetricus Hall, 1858: Geol. Iowa, vol. I, p. 573, pi. x, 



flg. 8a-b. 

 Aciinocnnus subturbinatus Meek & Worthen, 1860: Proc. Acad. Nat. Sci., 



Phila., p. 388. 

 Dorycrinus symmetricus Meek &, Worthen, 1873: Geol. Sur. Illinois, vol. V, 



p. 380. 

 Dorycrinus subturbinatus Meek & Worthen, 1873: Geol. Sur. Illinois, vol. 



V, p. 380. 

 Dorycrinus parvus Waehsmuth & Springer, 1881: Proc. Acad. Nat. Sci., 



PhUa., p. 353. (Revision, p. 179.) 

 Dorycrinus amcenus Miller, 1890: Geol. Sur. Missouri, Bui. 4, p. 35, pi. v, 



figs. 5, 6. 



Calyx much like that of D. suhaculeatus, but somewhat 

 smaller, almost spherical, with small, sharply projecting arm 

 lobes. Surface without ornamentation. Ventral portion hem- 

 ispherical, without spines or nodes. 



Horizon and localities — Lower Carboniferous, Upper 

 Burlington limestone : Palmyra, Sedalia, Ash Grove, and in St. 

 Louis county. 



Dorycrinus missouriensis (Shumard). 



Actinocrinus missouriensis Shumard, 1855: Geol. Sur. Missouri, Ann. 



Rep., p. 190, pi. A, figs. 4a-c. 

 Actinocrinus desideratus Hall, 1861: Boston Jour. Nat. Hist , vol. VIT, p. 



273. 

 Dorycrinus missouriensis Meek & Worthen, 1873 : Geol. Sur. Illinois, vol. 



V, p. 380. 

 Dorycrinus desideratus Meek & Worthen, 1873 : Geol. Sur. Illinois, vol. V, 



p. 380. 

 Dorycrinus missouriensis Wachsmuth & Springer, 1881 • Proc. Acad. Nat. 



Sci., Pnila., p. 353. (Revision, p. 179.) 



Calyx higher than wide ; plates thick, each marked by a 

 central prominence ; basals massive, rather high, with the lower 

 border surrounded by a thick rounded rim, which is notched 

 at the sutures ; articular facet for the column circular slightly 

 concave, and occupying about one-third of the diameter of the 

 base. Eadials large, as wide as long, three hexagonal and two 

 heptagonal ; upper oblique edges short, superior edges slightly 

 concave. First costals small, not more than one-fourth as large 



