1881.] NATURAL SCIENCES OP PHILADELPHIA. 407 



Macrostylocrinus Hall. 



M. fasciatus Hall, syn. of Macrostylocr, Meekii. 



Mariaorians Hall (partly syn. of Melocrinus. 



M. macropetalus Hall (compare with Corymbocrinus). 

 M. nobilissimus Hall, see Melocr. nobilissimus. 

 M. pachydactylus Hall, see Melocr. pachydactylus. 

 M. paucidactylus Hall, see Melocr. paucidactylus. 

 M. penniger Salter (MS.). No description published. 

 M. stoloniferus Hall. Described from columns. 



Marsupiocrinus Phillips. 



M. dactylus Hall, see Lyriocr. dactylus. 



M. dubius Angelin. Evidently an Actinocrinoid. 



Medusacrinus Austin. Not defined. 

 Megistocrinus Owen and Shumard (not Angelin). 



M. infelix Winchell and Marcy, see Periechocr. Christyi (Hall). 



M. Marcouanus Winch, and Marcy, see Periechocr. Christyi (Hall). 



M. necis Winch, and Marcy. Described from casts. 



M. parvirostris Meek and Worth., see Megistocr. Evansii. 



M. plenus White, syn. of Megistocr. Evansii. 



31. Whitei Hall, see Periechocr. Whitei. 



Melocrinus Goldfuss. 



M. amphora Goldfuss, syn. of Amphoracr. Gilbertsoni. 



M. sculptus Hall. Described from basal plates. 



M. angustus Angelin, see Mariacr. angustus. 



M. obconicus Hall, see Mariacr. obconicus. 



M. kevis Goldf. (not Roemer), syn. of Melocr. gibbosus. 



M.fornicatus Goldf., syn. of Melocr. pyramidalis. 



Ophiocrinus Angelin. Preoccupied by Salter, 1852, and Semper, 1868. 

 Fentagonites Rafinesque. Described from detached plates. 

 Feriechocrinus Austin. 



P. anulatus Angelin. Described from detached plates. 



P. costatus Austin, syn. of Periechocr. moniliformis, 



P. geometricus Angelin. Detached plates. 



P. globosus Austin. Not defined. 



P. grandiscutatus Angelin. Detached plates. 



P. Ixvis Angelin (not Portlock), see Periechocr. minor W. and Spr. 



P. multicostatus Angelin. Detached plates. 



P. undulatus Angelin. Detached plates. 



Fhillipsocrinus McCoy, see Melocrinus and Actinocrinus. 



P. caryocrinoides McCoy. Probably a malformed Actinocrinus. 



