258 PROCEEDINGS OP THE ACADEMY OP [1881. 



1863. Dichocr. granalosas Dc Kon. and Leh. Rech. Grin. Carb. Belg., p. 152, PI. 4, 



fig. 12. Mount, liinest. Tournay, Belg. 

 1853. Dichocr. intermediuB Be Kon. and Leh. Rech. Crin. Carb. Belg., p. 150, PI. 



4, fig. 9. Mount, limest. Tournay, Belg. 

 1853. Dichocr. irregularis De Kon. and Leh. Rech. Crin. Carb. Belg., p. 152, PI. 



4, figs. 11 a, b. Mount, limest. Tournay, Belg. 



1860. Dichocr. Isevis Hall. Supp. Geol. Rep. Iowa, p. S3. Lower Burlington 



limest. Burlington, Iowa. 

 1869. Dichocr. lineatns Meek, and Worth. Proc. Acad. Nat. Sci. Phila., p. 69; also 

 Geol. Rep. 111., v, p. 440, PI. 3, fig. 1. Lower Burlington limest. Burling- 

 ton, Iowa. 



1861. Dichocr. liratus Hall. Desc. New Sp. Pal. Crin., p. 5; also Boat. Jour. Nat. 



Hist., p. 290, Photog. PI. 2, figs. 7, 8. Upper Burlington limest. Burling- 

 ton, Iowa. 



*1881. Dichocr. ornatus Wachsm. and Spr. (Dichocr. sculptus Lyon and Cass., not 

 De Kon. and Leh., 1853). Proc. Am. Acad. Arts and Sci., v, p. 25. Keokuk 

 limest. Hardin Co., Ky. We propose the above name, D. sculptus being 

 preoccupied. 



1850. Dichocr. ovatus Ow. and Sh. Jour. Acad. Nat. Sci. Phila. (new sr.) ii, Pt. i; 

 also U. S. Geol. Rep. Iowa, Wis. and Minn., p. 590, PI. 5 A, figs. 9 a-b. 

 Lower Burlington limest. Burlington, Iowa. 



1869. Dichocr. pisum Meek and Worth. Proc. Acad. Nat. Sci. Phila., p. 69; also 

 Geol. Rep. 111., v, p. 440, PI. 3, fig. 2. Lower Burlington limest. Burling- 

 ton, Iowa. 



1861. Dichocr. plicatus Hall. Desc. New Pal. Crin., p. 4 ; also Bost. Jour. Nat. Hist, 

 p. 288, Phot. PI. 2, figs. 9,10. Upper Burlington limest. Burlington, Iowa. 



1861. Dichocr. pocillum Hall. Desc. New Sp. Crin., p. 5; also Bost. Jour. Nat. Hist., 

 p. 291, Phot. PI. 2, figs. 15, 16 (Fig. 14 is evidently Meek and Worthen's 

 D. laevis, which occurs in the Upper Burlington beds). Lower Burlington 

 limest. Burlington, Iowa. 



1860. Dichocr. polydactylus Casseday and Lyon. Proc. Am. Acad. Arts and Sci., v, 



p. 20. Keokuk limest. Crawfordsville, Ind. 



Syn. D. expansus Meek and Worth (not De Kon. and Leh., 1853). Proc. 

 Acad. Nat. Sci. Phila., p. 344; also Geol. Rep. 111., v, p. 500, PI. 14, fig. 1. 



The original description by Cass, and Lyon is somewhat erroneous as to the 

 arrangement of the arms, and this probably led Meek and Worthen to pro- 

 pose a new species. There is no doubt of the identity of the two. 

 1838. Dichocr. radiatus Miinster. Type of the genus. Beitr. z. Petref., i, p. 2, PI. 

 1, figs. 3 a-d ; De Koninck, 1842, Desc. Anim. Foss., p. 40, PI. i, figs. 6 a-d ; 

 Austin, 1843, Mon. Rec. and Foss. Crin., p. 45, PI. 5, figs. 5 a-d; D'Orbigny, 

 1850, Prodr. de Paleont. i, p. 166; De Kon. and Leh., 1853, Rech. Crin. 

 Carb. Belg. p. 149, PI. 4, figs. 8 a-d ; Pictet, 1857, Traite de Paleont. iv, p. 

 333, PI. 101, fig. 18; Bronn, 1860, Klassen d. Thierreichs, ii, PI. 28, figs. 9 

 a-b. Mount, limest. Mendip Hills, Eng., and Tournay, Belg. 



1861. Dichocr. scitulus Hall. Desc. New Pal. Crin. p. 4; also Bost. Jour. Nat. 



Hist., p. 289. Lower Burlington limest. Burlington, Iowa. 

 1853. Dichocr. sculptus De Kon. and Leh. (not Cass, and Lyon, 1860). Rech. Crin. 



Carb. Belg., p. 154, PI. 4, figs. 14 a, b, c. Mount, limest. Tournay, Belg. 

 1857. Dichocr. simplex Shmmard. Trans. Acad. Sci. St. Louis, p. 74, PI. 1, fig. 2; 



Hall, 1858, Geol. Rep. Iowa, i, Pt. ii, p. 654, PI. 23, figs. 12 a, b. Warsaw 



limest. Spurgeon Hill, Ind.; also St. Mary's Landing, Mo., and Sparta, Tenn. 



