276 



ECHINODERMA TA. 



[PRO. — PYC. 



Fig. 409.— Protaster flexuosut. 



verfwillus, Hall, 1862, 15th Rep. N. Y. 



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

 wachsmutlii, Meek & Worthen, see Graphi- 



ocrinus wachsinuthi. 

 wachsmutlii, Wetherby, 1880, (Scyta- 



loerinua wachsmuthi,) Jour. Cin. Soc. 



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

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



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



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



Sci., p. 27, Chemung Gr. 



Protastek, Forbes, 184y, Mem. Geo. Sur. 



Great Britain, Decade 1. [Ety. protos, 



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



Sos-d of squauiiform plates ; rays 

 exuous, composed of two series of 

 ambulacral plates, bordered by spinous 

 adambulacral ones; oral plates five. 

 Type P. miltoni. 

 barrisi, see Onychaster barrisi. 



flexuosus, 

 Miller & 

 Dyer, 1878, 

 Jour. Cin. 

 Soc. Nat. 

 Hist., vol. 1, 

 p. 31, Utita 

 Slate & Hud. 

 Riv. Gr. 

 forbesi, Hall, 

 1859, Pal. 

 N. Y., vol. 3, p. 134, Low. Htdd. 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 (ir. 

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

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

 Riv. Gr. 

 stellifer, Ringueberg, 1886, Bull. Buff. Soc. 



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

 Protasterina, syn. for Prot aster. 

 fimbriate, syn for Protaster flexuosus. 

 Ptekotocrinus, Lyon & Ca88eday,1860, Am. 

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

 feathered ; krinon, lily.] Calyx saucer- 

 shaped, wider than high; vault high, 

 witli 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 

 3 x20 ; azygous in- 

 terradial 1 ; arms ^ii _ 



20,reachingonlyto £nJP\ 

 the vault ; column ga^K^ \ f\ 

 round. Type P. ^^^vV 

 capi talis. <~~^vtf(Jk iY^"' 



acutus, Wetherby, \ \^.J//~~? 

 1879, Jour. CiD. U^^^nV 



Soc. Nat. Hist., vol. / \ ^ 



2, p. 134, Kaskas- ^ 



kia Gr. Fio.410.— Pterotocrinus 



bifurcatus, Wether- ^ e ^ teren8ls - Dia * 

 by, 1879, Jour. g 

 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, L880, 

 ( Actinocrinus chesterensis,) Proc. Acad. 

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

 111., vol. 2, p. 292, Kaskaski t (ir. 



coronarius, Lyon, 1857, ( Asterocrinns cor- 

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

 Kaskaskia Gr. 



FiO. 411.— Pterotocrinus crossus. Diagram. 



crassus, Meek & Worthen, I860, (Dicho- 



crinus crassus,) Proc. Acad. Nat Sci. 



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



p. 290, Kaskaskia (ir. 

 depressus, Lyon & Casseday, 1860, Am. 



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



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

 protuberans, Hall, 1858, (Dichocrinns 



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



Kaskaskia I rr. 

 pyramidalis, Lvon & Casseday, 1860, 



Am. Jour. Sci., vol. 29, p. 6!), Kaskas- 

 kia Gr. 

 rugosus, Lyon & Casseday, 1800, Am. 



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

 kia (ir. 

 aexlobatus, see Talarocrinus sexlobatus. 

 spat u la tus, Wetherby, 1879, Jour. Cin. 



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

 kia ( Jr. 

 PtHonaster, Hall, 1868, syn. for Palseocoma. 



■princrpg, see Palseocoma princeps. 

 Ptychocrinw, Wachsmuth & Springer, 1886, 



Revis. Palseoorinoidea, 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.] Calyx 



small, cup-shaped ; basals 



5; radials 3x5; regular 



interradials 3; arms 10, 



sometimes dividing after 



becoming free. Type P. 



shafferi. 

 germanus, S. A. Miller, 1880, 



(Glyptocrinus shafferi var. 



germanus,) Jour. Cin. Soc. 



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



Hud. Riv. Gr. 

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



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



Fia. 412. 

 Pycnocrinus 

 germanus. 



