PAL. PEN.] 



ECHINODERMA TA. 



267 



cylindrica, see Tseniaster cylindricus. 

 princeps, Hall, 1868, (Ptilonaster prin- 

 ceps,) 20th Eep. N. Y. St. Mus. Nat. 

 Hist., p. 334, Chemung Gr. 

 spinosa, see Taeniaster spinosus. 

 PAL^EOCRINUS, Billings, 1859, Can. Org. Rem., 

 Decade 4, p. 24. [Ety. palaios, ancient ; 

 krinon, lily.] Calyx oval or pyriform ; 

 basals 5 ; radials 1x5; azygous inter- 

 radials 1 to 3 ; calycinal ambulacra 5, 

 radiating from the center to the bases 

 of the arms. Type P. striatus. 



angulatus, Billings, 1857, 

 (Dendrocrinus an- 

 gulatus,) Rep. of Prog. 

 Geo. Sur. Can., p. 269, 

 and Can. Org. Rem., 

 Decade 4, p. 24, Trenton 

 Gr. 



pulchellus, Billings, 1859, 

 Can. Org. Rem., Decade 

 4, p. 45, Trenton Gr. 

 rhombiferus, Billings, 1859, 

 Can. Org. Rem., 

 Decade 4, p. 45, 

 Trenton Gr. 

 striatus, Billings, 

 1859, Can. Org. 

 Rem., Decade 4, 

 . 25, Chazv Gr. 



FIG. 383. Pal- 

 seocrinus stri- 

 atus. 



striatus. Diagram. 

 Not defined. 



PALJSOCYSTITES, Billings, 1858, Can. Org. 

 Rem., Decade 4, p. 68. [Ety. palaios, 

 ancient; kustis, bladder.] Body oval 

 or pyriform ; plates numerous and 

 poriferous at the margins. Type P. 

 tenuiradiatus. 

 chapmani, Billings, 1858, Can. Org. Rem., 



Decade 3, p. 71, Chazy Gr. 

 dawsoni, Billings, 1858, Can. Org. Rem., 



Decade 3, p. 70, Chazy Gr. 

 pulcher, Billings, 1859, Can. Nat. Geo., 



vol. 4, p. 430, Chazy Gr. 

 tenuiradiatus, Hall, 1847, (Actinocrinus 

 tenuiradiatus,) Pal. N. Y., vol. 1, p. 18, 

 Chazy Gr. 



Parisocrinus, Wachsmuth & Springer, 1879, 

 Proc. Acad. Nat. Sci. Phil., p. 115. 

 [Ety. parisos, resembling ; krinon, lily.] 

 A division of Poteriocrinus of less 

 than generic value, with P. perplexus 

 as the type, and including P. nereus. 

 P. salignpides, P. teniubrachiatus, and 

 Cyathocrinus intermedius. 



Penlacrinites hamptoni, Emmons, 1842, Geo. 

 Rep. N. Y., Trenton Gr. This is 

 merely the plate of a crinoid column. 



Pentagonites, proposed by Rafinesque for a 

 crinoid column. 



PKNTRKMITES, Say, 1820, Am. Jour. Sci., vol. 

 2, p. 36. [Ety. pente, five ; remos, a 

 board or plate.] Calyx globose, ovoid, 

 or pyriform ; base never distinctly tri- 

 lobate, nor excavated in the middle 

 line ; section more or less triangular ; 

 basals 3, forming a small cup ; radials 

 or fork plates 1 x 5, long, forming 

 the greater part of the calyx ; limbs 



long, with flat or concave sides and 

 truncated above ; sinus, subpetaloid ; 

 deltoid plates 1x5, small ; ambulacra 

 subpetaloid, resting in the sinuses or 

 forks of the radials ; lancet plates rest- 

 ing below on under lancet plates, and 

 forming about a third the width of the 

 ambulacra ; side plates numerous and 

 abutting the lancet plates; hydrospire 

 or ambulacra! pores partially excavated 

 out of the sides of the sinuses ; pin- 

 nules attached between the pores ; 

 hydrospires from 3 to 9, pendent, but 

 partially contained within the sub- 

 stance of the radials near their distal 

 ends; spiracles or apertures single or 

 double, partially excavated in the 

 deltoid plates; posterior spiracles con- 

 fluent with the azygous opening ; 

 peristome covered by minute poly- 

 gonal plates ; column round. Type P. 

 godoni. 



abbreviatus, Hambach, 1880, Trans. St. 

 Louis Acad. Sci., vol. 4, p. 155, Kas- 

 kaskia Gr. 



angularis, Lyon, 1860, Trans. St. Louis 

 Acad. Sci., vol. 1, p. 631, Kaskaskia Gr. 



basilaris, Hambach, 1880, Trans. St. Louis 

 Acad. Sci., vol. 4, p. 145, Kaskaskia Gr. 



bipyramidalis, Hall, 1858, see Troostocrinus 

 bipyramidalis. 



bradleyi, Meek, 1873, 6th Rep. Geo. Sur. 

 Terr., p. 470. Not satisfactorily de- 

 fined. 



broadheadi, Hambach, 1880, Trans. St. 

 Louis Acad. Sci., vol. 4, p. 145, Kas- 

 kaskia Gr. 



burlingtonensis, Meek & Worthen, 1870, 

 Proc. Acad. Nat. Sci. Phil., and Geo. 

 Sur. 111., vol. 5, p. 461, Burlington Gr. 



calyce, Hall, 1862, 15th R*p. N. Y. St.- 

 Mus. Nat. Hist., p. 122, Ham. Gr. 



calycinus, Lyon, 1860, Trans. St. Louis 

 Acad. Sci., vol. 1, p. 628, Kaskaskia Gr. 



cervinus, Hall, 1858, Geo. Sur. Iowa, p. 



690, Kaskaskia Gr. 



cherokeus, Troost, 1850, Catal. Proc. Am. 

 Assoc. Ad. Sci. and Geo. Sur. Iowa, p. 



691, Kaskaskia Gr. 



chesterensis, Hambach, 1880, Trans. St. 

 Louis Acad. Sci., vol. 4, p. 145, Kas- 

 kaskia Gr. 



clavatus, Hambach, 1880, Trans. St. Louis 

 Acad. Sci., vol. 4, Kaskaskia Gr. 



conoideus, Hall, 1858, Trans. Alb. Inst., 

 vol. 4, p. 5, and Geo. Sur. Iowa, p. 

 655, Warsaw Gr. 



cornutus, see Granatocrinus cornutus. 



curtus, see Granatocrinus curtus. 



decussatus, Shumard, 1858, Trans. St. 

 Louis Acad. Sci., vol. 1, "p. 243, 

 Keokuk Gr. 



elegans, Lyon, 1860, Trans. St. Louis 

 Acad. Sci., vol. 1, p. 632, Kaskas- 

 kia Gr. 



elongatus, Shumard, 1855, Geo. Rep. Mo., 

 p. 187, Burlington Gr. 



florealis, Schlotheim, 1820, syn. for P. 

 godoni. 



