1879.] NATURAL SCIENCES OP PHILADELPHIA. 343 



*1861. Pot. (Decadocr.) scalaris Meek & Worthen. Type of this group (Scaphiocr. 



scalaris). Proc. Acad. Nat. Sci. Phil., p. 145. Geol. Rep. III., vol. v. p. 



421, pi. 2, fig. 10. Upper Burl, limest. Subcarb. Burlington, Iowa. 

 *1864. Pot. (Decadoc.) subtortuosus Hall. (Scaphiocr. subtortuosus.) 17th Rep. 



N. Y. St. Cab., p. 59. Geol. Surv. Ohio, Pal., vol. ii. p. 177, pi. 12, figs. 



15, 16. Waverly Gr. Subcarb. Richfield, Ohio. 



G. Species of Poteriocrinus, imperfectly known. 

 1858. Poteriocr. calyculus Hall. Geol. .Rep. Iowa, vol. i. pL 2, p. 553, pi. 9, figs. 



6 a, (5 b. Lower Burl, limest. Subcarb. Burlington, Iowa. 

 1836. Poteriocr. conicus Phillips. Geol. Yorksh., ii. pi. 4, fig. 3. Portlock's Geol. 



Rep., pi. 16, fig. 12. De Koninck, 1842, Animaux Foss., p. 47, pi. F, fig. 3; 



Milne Edwards ap. Lamark, p. 664; Austin, 1843, Rec. and Foss. Crin., 



p. 82, pi. 10, figs. 3 a, b, c. Subcarb. England, Ireland, and Belgium. 

 1853. Poteriocr. conoideus De Koninck & Lehon. Recherch. Crin. Belg., p. 93, pi. 



1, figs. 8 a, b. Subcarb. Vise, Belgium. 

 1869. (?)Poteriocr. cylindricus Lyon. (Not Hall=Homocr. cylindricus). Trans. 



Am. Philos. Soc, Philad., vol. xiii. p. 458, pi. 27, fig. 1. Encrinal limest. 



Subcarb. Falls of the Ohio. (Imperfect specimen.) 

 1842. Poteriocr. gracilis McCoy. (Not Pot. gracilis Hal! = Dendocr. gracilis.) 



Carb. Foss. Ireland, p. 178, pi. 25, figs. 11-14. Subcarb. Ireland. 

 1873. Poteriocr. Hardinensis Worthen. Geol. Rep. 111., vol. v. p. 533, pi. 20, fig. 



10. St. Louis limest. Subcarb. Hardin Co. , 111. 

 1836. Poteriocr. impressus Phillips. Geol. Yorksh., ii. p. 205, pi. iv. fig. 1 ; Austin, 



1843, Rec. and Foss. Crin., pi. 10, fig. 6. (Not Pot. impressus Richter & 



Unger. Geognost. Rossica, 1860, pi. 31, fig. 46.) Subcarb. England. 

 1861. Poteriocr. indentus Hall. 15th Rep. N. Y. St. Cab., p. 122. Hamilton Gr. 



Devonian. Ontario Co., N. Y. 

 *1861. Poteriocr. laeviculus Lyon. (Cyathocr. laeviculus.) Proc. Acad. Nat. 



Sci. Phil., p. 409. Encrinal limest. Subcarb. Jefferson Co., Ky. 

 1875. Poteriocr. Lasallensis Worthen. Geol. Rep. 111., vol. vi. p. 526, pi. 32, fig. 



3. Upper Coal Measures. Lasalle, III. 

 1861. Poteriocr. lepidus Hall. Desc. New Pal. Crin., p. 6 ; Bost. Journ. Nat. Hist. 



p. 304. Lower Burl, limest. Subcarb. Burlington, Iowa. 

 1873. Poteriocr. macoupiensis Worthen. Geol. Rep. 111., vol. v. p. 561, pi. 24, fig. 



3. Coal Measures, 111. 

 1850. Poteriocr. minutus F. A. Roemer. Beitr. zur Kenntn. d. Harzgeb. , p. 47, 



pi. 8, figs. 1 a-d. Posidonien Schiefer. Devonian. Lauthenthal. Germany. 

 1872. Poteriocr. montanaensis Meek. Hayden's Rep. U. S. Geol. Surv. Terr. 



Lower Carbon. Montana Territory. 

 1861. Poteriocr. nassa Hall. 15th Rep. N. Y. St. Cab., p. 120. Hamilton Gr. 



Devonian. Canandaigua, N. Y. 

 1861. Poteriocr. nereus Hall. 15th Rep. N. Y. St. Cab., p. 121. Hamilton Gr. 



Devonian. Ontario Co., N. Y. 

 1861. Poteriocr. nodobrachiatus Hall. Desc. New Pal. Crin., p. 8; Bost. Journ. 



Nat. Hist., p. 614. Keokuk limest. Subcarb. Crawfordsville, Ind. 

 1858. (?)Poteriocr. pachydactylus Miiller. Monatsber. Berl. Acad., p. 192. De- 

 vonian. Germany. (No means of comparison.) 

 1858. (?)Poteriocr. patulus Miiller. Monatsber. Berl. Acad. Devonian. Ger- 

 many. (No means of comparison.) 



