1881.] NATURAL SCIENCES OF PHILADELPHIA. 409 



P. Milleri McCoy (Pictet), Cyathocrinus {?). 



P. minutus Schnurr, syn. of Storthingocr. fritillus. 



P. multibrachiatus Meek and Worth., syn. of Platycr. discoideus. 



P. muricatus Goldf., syn. of Hexacr. anaglypticus. 



P. nodulosus Qoldf. (not Hall), see Symbathocr. nodulosus. 



P. nodobrachiatus Hall (1861, not 1858), see PL perasper. 



P. nodosus Wirtgen and Zeiler, see Culicocr. nodosus. 



P. olla Hall (not de Kon.), syn. of PL Halli Shum. 



P. ornatus Goldf. (not McCoy), see Hexacr. ornatus. 



P. Oweni Meek and Worth., syn. of Platycr. regalis Hall. 



P. parous Hall, see Cordylocr. parvus. 



P. pentangularis Miller. A Blastoid. 



P. Pkillipsii d'Orbigny, syn. of Hexacr. macrotaius. 



P. planus Owen (not Owen and Shum). Not defined. 



P. plumosus Hall, see Cordylocr. plumosus. 



P. polydactylus Troost. Catalogue name. 



P. punctobrachiaius Hall (probably not Platycrinus). 



P. pusillus Goldf., syn. of Storthingocr. fritillus. 



P. ramulosus Hall, see Cordylocr. ramulosus. 



P. retiarius Phillips. (We found no description). 



P. rosaceus Roemer, see Coccocr. rosaceus. 



P. rosaceus Goldf., syn. of Hexacr. callosus. 



P. rugosus Goldf. (not Miller), Storthingocr. fritillus. 



P. scaber Goldf., Storthingocr. fritillus. 



P. scobiculaia-lmediixxs Goldf., Storthingocrinus. 



P. stellaris Roemer, see Hexacr. stellaris. • 



P. striobrachiatus Hall, syn. of Platycr. corrugatus. 



P. tabulaius Goldf., Symbathocr. tabulatus. 



P. Tennesseemis F. Roemer, Marsupiocr. Tennesseensis. 



P. tentaculatus Hall, see Marsupiocr, tentaculatus. 



P. triacontadactylus, syn. of PL trigintidactylut. 



P. truncatus Hall, syn. of Platycr. americanus. 



P. ventricosus Goldf., see Hexacr. ventricosus. 



P. verrucosus White, syn. of Platycr. pocilliformis, 



Pleurocrinus Austin, see Platycrinus. 



Pomatocrinus Koenig, MS., not published. 



Pradocrinus de Verneuil, syn. of Periechocrinus. 

 P. Baylii de Verneuil, see Periechocr. Baylii. 



Pterotocrinus Lyon and Casseday. 



P. rugosus Lyon and Cass. Not sufficiently defined. 



Pyxidocrinus MUUer (see our remarks on Actinocrinidce). 

 P. pruiniensis Miiller, see Dorycr. prumiensis. 



