354 PROCEEDINGS OF THE ACADEMY OF [1881. 



*18C2 (?) Doryor. prseoursor Hall. (Aotinocr. prseoursor) 15th Rep. N. Y., St. 



Cab. Nat. Hist., p. 131. Hamilton gr. Western New York. 

 We refer this species with doubt to the genus; it is imperfectly known. 

 *1855. Doryor. prumiensis MUUer. (Aotinocr pramiensis) Verhand. Naturhist. 



Verein. f. Rheinlande, xii, p. 81, PI. 9, figs. 1, 5; also 1857. Pyxidocr. 

 ' prumiensis Neue Echin. Eifl. Kalk, p, 263, Schultze, 1867, Mon. Echin. 



Eifl. Kalk, p. 60, PI. 6, fig. 6. Devon. Eifel, Germ. 

 1868. Doryor. qainqaelobns (var.) intermedins Meek and Worth. Proc. Acad. 



Nat. Sci. Phila., p. 346; Geol. Rep. 111., v, p. 385, PL 10, fig. 4. Transition 



bed between Burl, and Keck, limest. Pleasant Grove, Iowa. This is more 



properly a variety of D. mississippiensis, from which it difi"ers only in 



having fewer arms and in its smaller size. 

 1868. Doryor. Koemeri Meek and Worth. Proc, Acad. Nat. Sci. Phila., p. 346; 



also Geol. Rep. 111., v, p. 383, PI. 10, fig. 3. Uppermost part of Upper Burl. 



limest. Burlington, Iowa. 

 *1860. Doryor. spinosulus Hall. (Aotinocr. spinosnlos) Supp. Geol. Rep. Iowa., 



p. 52, Keokuk limest. Nauvoo, 111. (Probably a young D. mississippiensis. 

 *1858. Doryor. subaculeatus Hall. (Aotinocr. subftcnleatns) Geol. Rep. Iowa, i, pt. 



ii, p. 570, PI. 10. figs. 2 a-b ; Meek and Worth., Doryor. snbaculeatns, Geol. 



Rep. 111., V, p. 380. Lower Burlington limest. Burlington, Iowa. 

 1850. Doryor. unicornis Owen and Shumard. (Aotinocr. unicornis) Joam. Acad. 



Nat. Sci. Phila., ii. (ser. ii), p. 67 ; also U. S. Geol. Rep. Iowa, Wis. and Minn., 



p. 573, PI. 5 a, figs. 12 a, b ; Hall, 1858, Geol. Rep. Iowa, i, pt. ii,p. 668, PI. 



10, figs, 5 a, b, c; Meek and Worth., 1873, Doryor. unicornis, Geol. Rep 



111. V, p. 380, PI. 6, fig. 2. Lower Burlington limest. Burlington, Iowa. 

 iSyn. Actinoor. tricornis Hall, 1858, Geol. Rep. Iowa, i, pt. ii, p. 569. 

 Si/n. Actinocr. pendens Hall, 1860. Ibid., Supp., p. 31. 

 *1861. Doryor. unispinus Hall. (Actinoor. unispinus) Desc. New Sp. Grin. p. 2; 



also Bost. Journ. Nat. Hist., p. 270. Lower Burlington limest. Burlington, 



Iowa. 



C. EHODOCRINID.!: Roemer. 

 (Amend. Zittel, amend. Wachsm. and Spr.) 



The genera which we include among the Rhodocrinidse were 

 arranged by the earlier writers, either in connection with such 

 genera as Cyathocrinus, Poteriocrinus, or in various ways with 

 Actinocrinus, Melocrinus, Dimerocrinus , Periechocrinus, Carpo- 

 crinus and others. 



Austin ^ placed Rhodocrinus and Sagenocrinus under the 

 Actinocrinoidea, Dimerocrinus under the Merocrinoidea. 



D'Orbigny^ placed Gilhertsocrinus and Dimerocrinus under 

 the Melocrinidje, Glyptocrinus and Rhodocrinus under the 

 Cyathocrinidae. 



1 Ann. and Mag. Nat. Hist., 1842-3. 

 * Course elem. de Paleont., 1852, vol. 2. 



