290 PROCEEDINGS OF THE AMERICAN ACADEMY 



C. PROTUBERANS, Hall, lowa, Vol. 1, p. 626, PI. 28, fig. 9. Suh- 

 carhoniferous. Keokuk limestone. 



C. PTRiFORMis, Sill. Journ., 1st Series, Vol. 48, p. 314. Silurian. 

 Lockport, New York. 



C. RAMOSUS, (?) King, Perm. Fossils, PI. 6, fig. 15-21. Swallow 

 and Hahn, Rocks of Kansas, 1858, in Trans. Acad. St. 

 Louis, p. 186. Permian rocks of Kansas. 



C. ROTUNDATUS, Hall, lowa. Vol. 1, p. 555, PI. 9, fig. 7, a, b. 

 Suhcarhoniferous. Burlington limestone. 



C. SPURius, Hall, Iowa, Vol. 1, p. 625, PI. 28, fig. 78. Suhcarhon- 

 iferous. Keokuk limestone. 



C. STELLATUS, Hall, 1. c. p. 623, PI. 16, fig. 3, 8. Troost, Monogi-. 

 and Proceedings. Suhcarhoniferous. Keokuk limestone. 



C. TUMiDUS, Hall, Iowa, Vol. 1, p. 624, PI. 18, fig. 1, b, c. Suh- 

 carhoniferous. Keokuk limestone. 



CYCLOCYSTOIDES, Billings and Salter, 1858. Silurian. From 

 the lower and middle Silurian rocks of Canada. 

 C. Davisi (Salter), Billings, Geo!. Survey of Canada, Palaeont., 

 Dec. III. p. 89. Silurian. 



C. Halli, Billings and Salter, Geol." Survey of Canada, Palaeont., 



Dec. III. p. 86. Silurian. Trenton limestone. 



DENDROCRINUS, Hall, 1852. 



D. LONGiDACTYLTJS, Hall, Palajont. New York, Vol. 2, p. 193, PI. 



43, fig. 1, a-k; PL, 42, fig. 7, a, b. Silurian. Niagara 

 group. 



DICHOCRINUS, Munster, 1839, 



D. CORNIGERUS, Shumard, Trans. Acad. St. Louis, Vol. 1, No. 1, 

 p. 72, PI. 1, fig. 1, a - d. Suhcarhoniferous. Buzzard Roost, 

 Alabama. 



D. OVATUS, Owen and Shumard, Geol. Survey of Wisconsin, Iowa, 

 and Minnesota, p. 590, PI. 5 A, fig. 9, a, b. Suhcarhon- 

 iferous. Burlington, Iowa. 



D. PROTUBERANS, Hall, lowa, Vol. 1, p. 689, PI. 25, fig. 7. Suh- 

 carhoniferous. Kaskaskia limestone. 



D. SEXLOBATUS, Shumard, Trans. Acad. St. Louis, 1857, Vol. 1, 

 No. 1, p. 73, PI. 1, fig. 3, a-c. Suhcarhoniferous. Archi- 

 medes limestone. 



