118 HYDROZOIDS AND CORALS. 



Palaeacis enormis (Mkek & Worthen). 



Sphenopterium enonne Meek & Worttien, 1860: Proc. Acad. Nat. Sei., Phila. 



p. 448. 

 Sphenopterium enorme Meek & Worthen, 1866: Geol. Sur. IlliQOiS, vol. II, 



p. 146, pi. xiv, figi. la-b. 

 Sphenopterium enorme var. depressum Meek & Worthen, 1866 : G-eol. Sur. 



Illinois, vol II, p. 146, pi. xiv, figs. 2a-b. 

 PalcBacis enortnis Miller, 1877: Cat. Am. Palfe. Foss., p. 43. 

 Palceacis enormis v&T. dtpressa Miller, 1877 : Cat. Am. Palae. Foss., p 43. 



Similar to P. obtusa, but usually smaller and cells fewer in 

 number. 



Horizon and locality. — Lower Carboniferous, Kinderhook : 

 Glarksville and Louisiana (Pike county). 



Palaeacis obtusa ( Meek & Worthen ). 

 Plate xiv, figs. la-b. 



Sphenopterium obtusum Meek & Worthen, 1860: Proc. Acad. Nat Sci., 



Phila., p. 448. 

 Sphenopterium compresiuin Meek & Worthen, 1860: Proc. Acad. Nat. Sci., 



Phila., p. 448. 

 Sphenopterimn obtuswn Meek & Worthen, 1866 : Geol. Sur. Illinois, vol. II, 



p. 233, pi. xvii, figs. 2i-e. 

 Sphenopterium compressum Meek & Worthen, 1866: Geol. Sur. Illinois, 



vol.11, p 234, pi. xvii, tigs. la-c. 

 Palaeacis obtusa Miller, 1877 : Cat. Am. Pal^. Foss., p. 43. 

 Palceacis co7npressa Killer , 1877: Cat. Am. Palse. Foss , p. 43. 



Corallum rather small, more or less distinctly wedge- 

 shaped, with the width somewhat greater than the height; 

 sides ornamented by fine, irregular or vermicular markings. 

 Corallites three to ten or more in number, rather large, deep, 

 more or less conical in shape, round or polygonal; septa 30 to 

 40 in number, usually appearing in fine raised lines. 



Horizon and localities. — Lower Carboniferous, Keokuk 

 limestone ; Clark county. 



Conopterium effusum Winchell. 



Plate xiv, flg. 10. 



Conopterium effusum Winchell, 1855: Proc. Acad. Nat. Sci , Phila., 

 p. 111. 



Corallum small, adherent, subspherical; composed of numer- 

 ous unequal, crowded corallites, which enlarge rapidly from 



