276 



ECHINODERMA TA. 



[PRO. PYC. 



verticillus, Hall, 1862, 15th Rpp. N. Y. 

 St. Mus. Nat. Hist., p. 94, Hani. Gr. 



waclismutlii, Meek & \Vorthen, see Graphi- 

 ocrinus wachsmuthi. 



wachsmuthi, Wetherby, 1880, (Scyta- 

 locriuus wachsmuthi,) Jour. Cin. Soc. 

 Nat. Hist., vol. 3, p. 155, Kaskaskia Gr. 



wetherbyi, S. A. Miller, 1879, Jour. Cin. 

 Soc. Nat. Hist., vol. 2, p. 36, Kas- 

 ka>kia Gr. 



zethus, Williams, 1882, Proc. Acad. Nat. 



Sci., p. 27, Chemung Gr. 

 PROT ASTER, Forbes, 1849, Mem. Geo. Sur. 

 Great Britain, Decade 1. [Ety. protos, 

 first ; aster, star.] Disk circular, com- 

 pos d of squainiform plates ; rays 

 flexuous, composed of two series of 

 ambulacral plates, bordered by spinous 

 adambulacral ones ; oral plates five. 

 Type P. miltoni. 



barriisi, see Onychaster barrisi. 



flexuosus, 

 Miller & 

 Dyer, 1878, 

 Jour. Cin. 

 Soc. Nat. 

 Hist., vol. 1, 

 p. 31, Utica 

 Slate & Hud. 

 Riv. Gr. 



FIG. 409. Protaster flexuosug. forbesi, Hall, 

 1859, Pal. 

 N. Y., vol. 3, p. 134, Low. Held. Gr. 



granuliferus, Meek, 1872, Am. Jour. Sci., 

 3d ser., vol. 3, p. 274, and Ohio Pal., 

 vol. 1, p. 68, Hud. Riv. Gr. 



gregarius, Meek & Worthen, 1869, Proc. 

 Acad. Nat. Sci. Phil., p. 169, and Geo. 

 Sur. 111., vol. 5, p. 509, Keokuk Gr. 



miamiensis, S. A. Miller, 1882, Jour. Cin. 

 Soc. Nat. Hist., vol. 5, p. 116, Hud. 

 Riv. Gr. 



stel lifer, Ringueberg, 1886, Bull. Buff. Soc. 

 Nat. Sci., vol. 5, p. 7, Niagara Gr. 



Protasterina, syn. for Protaster. 



fimbridta, syn for Protaster flexuosus. 

 PTEROTOCRINUS, Lyon & Casseday, 1860, Am. 

 Jour. Sci., vol. 29, p. 68. [Ety. pterotos, 

 feathered ; krinon, lily.] Calyx saucer- 

 shaped, wider than high ; vault high, 

 with five wing-like processes that char- 

 acterize this genus ; basals 2 ; radials 1 

 or 2 x 5, the second being small ; second- 

 ary radials 1x10; tertiary radials 2 or 

 3x20; azygousin- 

 terradial 1; arms 

 20,reachingonlyto 

 the vault ; column 

 round. Type P. 

 capitalis. 



acutus, Wetherby, 

 1879, Jour. Cin. 

 Boc. Nat. Hist., vol. 

 2, p. 134, Kaskas- 

 kia Gr Fio.410. Pterotocrinus 



bifurcatus, Wether- e c ,!' e m tere n 8 ' 8 Dia - 

 by, 1879, Jour. g m 

 Cin. Soc. Nat. Hist., vol. 2. p. 136, 

 Kaskaskia Gr. 



capitalis, Lyon, 1857, (Astrocrinus capi- 

 talis,) Geo. Sur. Ky., vol. 3, p. 472, Kas- 

 kaskia Gr. 



chesterensis, Meek & Worthen, 1860, 

 (Actinocrinus chesterensis,) Proc. Acad. 

 Nat. Sci. Phil., p. 383, and Geo. Sur. 

 111., vol. 2, p. 292, Kaskaskia Gr. 



coronarius, Lyon, 1857, ( Asterocrinns cor- 

 onarius,) Geo. Sur. Ky., vol. 3, p. 476, 

 Kaskaskia Gr. 



FIG. 411. Pterotocrinus crassus. Diagram. 



crassus, Meek & Worthen, 1860, (Dicho- 



crinus crassus,) Proc. Acad. Nat. Sci. 



Phil., p. 382, and Geo. Sur. 111., vol. 2, 



p. 290, Kaskaskia Gr. 

 depressus, Lyon & Casseday, 1860, Am. 



Jour. Sci., vol. 29, p. 68, and Geo. Sur. 



III., vol. 5, p. 559, Kaskaskia Gr. 

 protuberans, Hall, 1858, (Dichocrinus 



protuberans,) Geo. Sur. Iowa, p. 689, 



Kaskaskia Gr. 

 pyraraidalis, Lvon & Casseday, 1860, 



Am. Jour. Sci., vol. 29, p. 69, Kaskas- 

 kia Gr. 

 rugosus, Lyon & Casseday, 1860, Am. 



Jour. Sci., vol. 29, p. 71, Kaskas- 

 kia Gr. 



sexlobatus, see Talarocrinus sexlobatus. 

 spatulatus, Wetherby, 1879, Jour. Cin. 



Soc. Nat. Hist., vol. 2, p. 137, Kaskas- 

 kia Gr. 

 Ptilonaster, Hall, 1868, syn. for Palseocoma. 



princeps, see Palseocoma princeps. 

 Ptychocrinus, Wachsmuth & Springer, 1886, 



Revis. Palaeocrinoidea, pt. 3, p. 99, syn. 



for Gaurocrinus. 

 PYCNOCRINUS, S. A. Miller, 1883, Jour. Cin. 



Soc. Nat. Hist., vol. 6, p. 231. [Ety. 



puknos, dense ; krinon, lily.] 



small, cup-shaped ; basals 



5 ; radials 3x5; regular j 



interradials 3 ; arms 10, 



sometimes dividing after 



becoming free. Type P. 



shafferi. 

 germanus, S. A. Miller, 1880, 



(Glyptocrinus shafferi var. p IO 412. 



germanus,) Jour. Cin. Soc. Pycuocriuus 



Nat. Hist., vol. 3, p. 233, germanus. 



Hud. Riv. Gr. 

 shafferi, S. A. Miller, 1875, (Glyptocrinus 



shafferi,) Cin. Quar. Jour. Sci., vol. 2, 



