286 PROCEEDINGS OF THE ACADEMY OF [1881. 



%». Agaricocr. tuberosus Troost, 1850 (catalogue name); Hall, 1858, (Jcol. 



Rep. Iowa, i, j)t. ii, j). 617. 

 S>/ii. Agaricocr. bullatus Hall. 1858, fieol. Rep. Iowa, i, pt. ii, p. 502, PL 9, 



figs. 11, a, b, e. 

 Si/ii. Agaricocr. (Amphoracr.) excavatus Ilall. Desc. New Spec. Crin., p. 3 ; 



also Bost. Joiirn. Nat. Hist., p. 282. 

 S^n. Agaricocr. nodosus Meek and Worthcn. Proc. Acad. Nat. Sci. Phila., 



p. 167 ; also Geol. Rep. Illinois, vol. v, p. 387, PI. 10, fig. 7. 

 *1S58. Agaricocr. brevis Hall (Actinocr. brevis). Geol. Rep. Iowa, i, pt. ii, p. 667, 



PI. 10, figs. 3, a, b. Lower Burlington limest. Burlington, Iowa. 

 Sijn. Actinocr. corniculus Hall. Geol. Rep. Iowa, 1, pt. ii, p. 566, PI. 10, figs. 



1, a, b, c. 

 *1860. Agaricocr. convexus Hall (Agaricocr. pentagonus (var.) convexus). Supp. 



Geol. Rep. Iowa, p. 58. Upper Burlington limest. Burlington, Iowa. 

 This form differs from A. pentagonus considerably, and proves to be a good 



species. 

 *1864. Agaricocr. oris Hall (Actinocr. eris). 17th Rep. N. York St. Cab. Nat. 



Hist., p. 53; also Geol. Rep. Ohio Paleont., ii, p. 164, PI. 11, figs. 9, 10. 



Waverly gr. Richfield, Ohio. A variety of Agaricocr. helice. 

 *1861. Agaricocr. fiscellus Hall. (Actinocr. fiscellus). Desc. New Pal. Crin., p. 



2 ; also Bost. Journ. Nat. Hist., p. 272. Lower Burlington limest. Bur- 

 lington, Iowa. 

 Possibly a mere variety of A. brevis, having an additional arm in the postero- 

 lateral rays. 



1860. Agaricocr. geometricus Hall. Suppl. Geol. Rep. Iowa, p. 56. Upper Bur- 



lington limest. Quincy, 111. 



1861. Agaricocr. gracilis Meek and Worthen. Proc. Acad. Nat. Sci. Phila., p. 135. 



Upper Burlington limest. Burlington, Iowa. 

 *1S64. Agaricocr. helice Hall (Actinocr. helice). 17th Rep. N. York St. Cab. Nat. 



Hist., p. 53; also Geol. Rep. Ohio, Paleont., ii, p. 163, PI. 11, figs. 5-8. 



Waverly gr. Richfield, Ohio. 

 1861. Agaricocr. inflatus Hall (Agaricocr. — Amphoracr. — inflatus, not Amphoracr. 



inflatus Hall). Descr. New Pal. Crin., p. 4; also Bost. Journ. Nat Hist., 



p. 284. Upper Burlington limest. Burlington, Iowa. 

 1861. Agaricocr. ornotrema Hall (Agaricocr. — Amphoracr. — ornotrema). Desc. 



New Spec. Crin., p. 3. Upper Burlington limest. Burlington, Iowa. 

 Si/n. Agaricocr. — Amphoracr. — bellatrema Hall. Bost. Journ. Nat. Hist., 



1861, p. 281. 



1860. Agaricocr. pentagonus Hall. Supp. Geol. Rep. Iowa, p. 57. Upper Burling- 



ton limest. Burlington, Iowa. 



1861. Agaricocr. planoconvexus Hall (Agaricocr. — Amphoracr. — planoconvexus). 



Desc. New Spec. Pal. Crin., p. 3; also Bost. Journ. Nat. Hist., p. 280. Lower 



Burlington limest. Burlington, Iowa. 

 ■•■■1858. Agaricocr. pyramidatus Hall (Actinocr. pyramidatus). Geol. Rep. Iowa, i, 



pt. ii, p. 665. Lower Burlington limest. Burlington, Iowa. 

 Syn. Agaricocr, (Amphoracr.) corrugatus Hall. 1861, Desc. New Spec. Pal. 



Crin., p. 4; also Bost. Journ. Nat. Hist., p. 283. (Hall described here a more 



mature specimen). 

 1881. Agaricocr. Springeri White. Indiana Rep. for 1881 (now in press). Keokuk 



limestone. Crawfordsville, Ind. 



