212 CRINOIDS. 



Scaphiocrinus rusticellus (White). 



Plate xxvi, fig. 1. 



Poteriocrinus rusticellus White, 1863 : Boston Jour. ISTat. Hist., p. 505, 

 Scaphiocrinus rusticellus Wachsmuth & Springer, .1879 : Proc. Acad. Nat. 

 Sci., Phila. ( Revision, p. 113). 



Calyx very small, ridged. Arms rather large, very long,, 

 with stout pinnules. 



Horizon and localities. — Lower Carboniferous, Lower Bur- 

 lington limestone : Hannibal ; Burlington ( Iowa ). 



Scaphiocrinus proboscidialis (Worthen). 



Poteriocrinus proboscidialis Worthen, 1875 : Geol. Sur. Illinoi?, vol. VI, p. 



518, pi. xxxi, fig. 1. 

 Scaphiocrinus p?'oboscidialii Wachsmuth & Springer, 1879 : Proc. Acad. Nat* 



Sci., Phila. (Revision, p. 114). 



Similar to S. missouriensis , but more robust ; calyx much 

 smaller. Arms bifurcating on the third brachial and again on 

 the seventh to tenth. 



Horizon and localities. — Lower Carboniferous, Saint Louis 

 limestone : Carondelet ( Saint Louis county). 



Scaphiocrinus scoparius Hall. 



Scaphiocrinus scoparius HaM, 1858 : Geology Iowa, vol. I, p.GSO, pi. xxv, 

 fig. 3- 



A very small form, with a relatively large, smooth calyx, 

 short, stout arms and large pinnules. 



Horizon and localities. — Lower Carboniferous, Kaskaskia 

 limestone : Chester ( Illinois ). 



Scaphiocrinus? boonvillensis Miller. 



Scaphiocrinus boonvillensis Miller, 1891 : Geol. Sur. Missouri, Bui. 4, p. 37, 



pi. V, figs. 1-2. 

 Scaphiocrinus const?'icius? Miller, 1891: Geol. Sur. Missouri, Bui. 4, p. 38, 



pi. V, figs. 3-4. 



A small form, resembling 8, rusticellus, but rather stouter. 

 Horizon and localities — Lower Carboniferous, Keokuk 

 limestone : Boonville. 



