CRINOIDS. 167 



Agaricocrinus brevis ( Hall). 



Actinoci'inus brevis Hall, 1858: Geol, Iowa, vol. I, p. 567, pi. x, figs. 



3a-b. 

 Aciinocrinus corniculus Hall, 1858: Geol. Iowa, vol. I, p. 5G7, pi. x, figs. 



la-c. 

 Agarieocrinus hrevis Wachsmuth & Springer, 1881: Proc. Acad. Nat. Sci., 



Phila., p. 286. 



Calyx rather small, depressed. Plates of the dorsal cup 

 depressed at the angles, thus forming short ridges, which pass 

 from one ossicle to another. 



Horizon and localities . — Lower Carboniferous, lower 

 Burlington limestone : Louisiana, Hannibal; Kinderhook (Illi- 

 nois); Burlington (Iowa). 



Agarieocrinus pianoconvexus Hall. 



Plate xxii, flgs. 7a-b. 



Agancocrinus 'pianoconvexus Hall, 1861: Boston Jour. Nat. Hist., vol. VII, 



p 280. 

 Agarieocrinus germanus Miller, 1892: Geol. Sur. Indiana, 18th Ann. Rep., 



adv. sheets, p. 42, pi. vii, figs. 8-10. 

 Agarieocrinus sampsoni Miller, 1892: Gcol. Sur. Indiana, 18th Ann. Rep., 



adv. sheets, p. 20, pi. iii, fig. 8. 

 Agarieocrinus blairi Miller, 1892: Geol. Sur. Indiana, 18th Ann. Rep. , 



adv. sheets, p. 21, pi. iii, figs. 12-15. 

 Agarieocrinus ehouteauensis Miller, 1892: Geoi. Sur. Indiana, 18th Ann. 



Rep., adv. sheets, p. 43, pi. vii, figs. 11-13. 



A small depressed form with smooth plates. 



Horizon and localities. — Lower Carboniferous, Kinder- 

 hook limestone : Sedalia ; Lower Burlington limetone : Hanni- 

 bal. 



Agarieocrinus pentagonus Hall. 



Plate xxii, fig. 9. 

 Agarieocrinus pentagonus Hall, 1860: Geol. Iowa, vol. I, Supp., p. 57. 



Calyx pyramidal ; dorsal cup flat, pentagonal : ventral side 

 elevated, with nodose plates. 



Horizon and localities. — Lower Carboniferous, upper 

 Burlington limestone : Ash Grove ( Greene county ), Ste. Gene 

 vieve. 



