388 TRANS. OF THE ACAD. OF SCIENCE. 



PLATYCRINUS (continued). 



discoideus, Owen & Shumard, 1850. Jour. Acad. Nat. Sci. Phil., 

 2d ser., vol. ii., p. 58, pi. 7, fig. 1.— 1852. Geol. Iowa, Wis 

 & Minn., p. 581, pi. 5 A., fig. 1.— Hall, 1858. Geol, Iowa 

 vol. i., pt. 2, p. 535, pi. 8, fig. 8. — Enc. — Burlington, Iowa 



Eboraceus, Hall, 1862. 15th Rep. Reg. State Cab. New York, p 

 119. — Ham. — Livingston Co., New York. 



elegans, Hall, 1861. Des. New Crin., Prelim. Not., p. 4.— 1861 



Jour. Bost. Soc. Nat. Hist., vol. vii., p. 285. — Enc. — Bur 



lington, Iowa. 

 Eriensis, Hall, 1862. 15th Rep. Reg. State Cab. N. York, p. 119. 



— Ham. — Livingston Co., New York. 

 e^uinubis, Hall, 1861. Des. New Crin., Prelim. Not., p. 17. — 



^Enc. — Burlington, Iowa, 

 excavatus, Hall, 1861. Des. New Crin., Prelim. Not., p. 4.— 1861. 



Bost. Jour. Nat. Hist., vol. vii., p. 286. — Enc. — Burlington, 



Iowa, 

 exsertus, Hall, 1858. Geol. Iowa, vol. i., pt. 2, p. 539, fig. 61. — 



Enc. — Burlington, Iowa. 

 Georgii, Hall, 1860. Geol. Iowa, Sup. to vol. i., p. 82. — Arch. — 



Warsaw, Illinois, 

 glyptus, Hall,, 1861. Des. New Crin., Prelim. Not., p. lft£ — Enc. 



— Burlington, Iowa, 

 graphicus, Hall, 1863. Crin. Wav. Sands. Ohio, p. 6. — Chem. — 



Summit Co., Ohio, 

 hemisphericus, Meek & VVorthen, 1865. Proc. Acad. Nat. Sci. 



Phil., p. 162. — Arch. — Niota, Hancock Co., Illinois, 

 incomptus, White, 1863. Jour. Bost. Soc. Nat. Hist., vol. vii., 



p. 503. — Enc. — Burlington, Iowa. 

 Huntsvillre,* Troost, 1850. List Crin. Tenn., Proc. Amer. Assoc. 



Camb. Meet., p. 61. — Kas. — Huntsville, Alabama. 

 Halli, Shumard — P. olla, Hall, 1861. Des. New Crin., Prelim. 



Not., p. 16. (Not P. olla, De Koninck & LeHon.) — Enc. — 



Burlington, Iowa. 

 inornatus, v. P. Burlingtonensis. 

 insculptus,* Troost, 1850. List Crin. Tenn., Proc. Amer. Assoc. 



Camb. Meet., p. 62. — Tennessee, 

 multibrachiatus, Meek & Worthen, 1861. Proc. Acad. Nat. Sci. 



Phil., p. 135. — Enc. — Burlington, Iowa. 

 Niotensis, Meek & Worthen, 1865. Proc. Acad. Nat. Sci. Phil., 



p. 162. — Arch. — Hancock Co., Illinois, 

 nodobrachiatus (Troost), Hall, 1858. Geol. Iowa, vol. i., pt. 2, p. 



542, fig. 63. (Not P. nodobrachiatus, Hall, 1861.) — Enc. — 



Burlington, Iowa. 

 nodobrachiatus, Hall, 1861 ; v. P. perasper. 

 nodulosus, Hall, 1858. Geol. Iowa, vol. i., pt. 2, p. 541. — Enc. — 



Burlington, Iowa. 



nucleiformis, Hall, 1858. Geol. Iowa, vol. i., pt. 2, p. 540. — Enc. 



— Burlington, Iowa. 

 olla, u. P. Halli. 



