PYO. — RHO.] 



ECHINODERMA TA. 



Til 



p. 277, and Jour. Cin. Soc. Nat. Hist., 

 vol. 3, p. 233, Hud. Riv. Gr. 



Fig. 414.— Pyc- 



n ocr i n u s 



sliafferi. En- 



FIG. 4U.-Pycnocri- | arged <ty 



diam. 



nus shatferi. 



Fig. 415. 

 Pyc nocri- 

 nus Shaf- 

 fer i. Col- 

 umn coll- 

 ed around 

 a column 

 of Ulypto- 

 crinus. 



Pygorhi/nchus gouldi. Not recognized. 

 Retiocrinus, Billings, 1858, Can. Org. Rem., 

 Decade 4, p. 63. [Ety. retium, net ; krinon, 

 lily.] Calyx basin-shaped ; radial ridges 

 very prominent ; basals 5, large ; sub- 

 radials 5, large; primary radials 4x5; 

 secondary radials 4 to 6x10; plates in 

 interradial areas, numerous, with a 

 large central row in the azygous area 

 extending up the side of a ventral tube ; 

 column round. Type R. stellaris. 

 fimbriatus, Billings, 1859, Can. Org. Rem., 



Decade 4, p. 65, Hud. Riv. Gr. 

 gracilis, Wetherby, syn. for Gaurocrinus 

 angularis. 



stellaris. Billings, 1859, 

 Can. Org. Rem., Dec- 

 ade 4, p. 64, Trenton 

 Gr. 

 Rhaphanocrinus, Wachs- 

 muth & Springer, 

 1885, Revis. Paheocri- 

 noidea, pt. 3, p. 98. 

 [Ety. raphanos, rad- 

 ish ; krinon, lily.] 

 Calyx short; basals 

 5, small ; subradials 

 5 ; primary radials 

 3x5; interradial s 

 numerous ; column 

 round. TypeR. sub- 

 nodosus. 

 subnodosu8, Walcott, 

 1883, Glyptocrinus subnodosus,) 35th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 208, 

 Trenton Gr. 

 Rhodocrinus, Miller, 1821, Nat. Hist., Cri- 

 noidea, p. 106. [Ety. rhodon, rose; 

 krinon, lily.] Body subslobose, often 

 wider than high, constricted near the 

 arm bases ; basals 5, small ; subradials 

 5; primary radials 3 to 4x5; secondary 

 radials 1 to 3x10; arms widely sepa- 

 rated, and composed of two rows of 

 interlocking plates; interradial areas 

 wide, plates large; vault depressed; 

 orifice excentric and protruding; col- 

 umn round. Type R. verus. 

 asperatns, Billings, 1859, Can. Org. Rem., 



Decade 4, p. 27, Chazy Gr. 

 barrisi, Hall, 1861, Desc. New Crin., p. 9, 

 and Jour. Bost. Soc. Nat. Hist., vol. 7, 

 p. 322, Burlington Gr. 



Fig. 41G. — Ketlocri 

 nus stellaris. 



barrisi var. divergens, Hall, 1861, Desc. 

 New Crin., p. 9, and Jour. Bost, Soc. 

 Nat. Hist., vol. 7, p. 322, Burling- 

 ton Gr. 



coxanus, Worthen, 1882, Bull. No. 1, 111. 

 St. Mus. Nat, Hist., p. 29, and Geo. Sur. 

 111., vol. 7, P. 305, Keokuk Gr. 



Fig. 417.— Rhodocrinus. Diagram. 



gracilis, Hall, 1862, 15th. Rep. N. Y. Mus. 



Nat. Hist., p. 127, Ham. Gr. 

 halli, Lyon, 1861, Proc. 



Acad. Nat. Sci. Phil., 



p. 412, Low. Held. Gr. 

 kirbyi, Wachsmuth & 



Springer, (in press,) 



Geo. Sur. 111., vol. 8, 



p. 180, Kinderhook 



Gr. 

 melissa, see Lyriocrinus 



melissa. 

 microbasalu, see Arch- 



aeocrinus microba- Fig. 418. -Rhodocri- 



sa ]j s nus nanus. 



nanus, Meek & Wor- 

 then, 1866, Proc. Acad. Nat. Sci. Phil., 



Fig. 419.— Rhodocrinus nanus. Diagram. 



p. 254, and Geo. Sur. 111., vol. 3, p. 476, 

 Burlington Gr. 



19 



