STE. STR.] 



ECHINODERMA TA. 



283 



plates ; adambulacrals square or ob- 

 long ; orals 10. Type S. salteri. 



FIG. 432. Sten aster grandia. 



grandis, Meek, 1872, Am. Jour. Sci., 3d 

 ser., vol. 3, p. 258, and Ohio Pal., vol. 1, 

 p. 66, Hud. Riv. Gr. 

 huxleyi, Billings, 1865, 

 Pal.'Foss., vol. 1, p. 213, 

 Quebec Gr. 



pulchellus, Billings, 1857, 

 (Palfeaster pulchellus,) 

 Geo. Sur. Can., p. 292, 

 and Can. Org. Reno., 

 Decade 3, p. 79, Tren- 

 ton Gr. 



salteri, Billings, 1858, Can. 

 Org. Rem., Decade 3, 

 p. 78, Trenton Gr. 

 Stenocrinus, Wachsmuth & 

 Springer, 1885, Palseo- 

 crinoidea, pt. 3, p. 207, 

 syn. for Heterocrinus. 

 STKPHANOCRINUS, Conrad, 

 1842, Jour. Acad. Nat. 

 Sci., vol. 8, p. 278. [Ety. 

 Stephanos, coronet ; kri- 

 non, lily.] A blastoid, 

 with 3 basals, 5 fork 

 pieces or radials, and 5 

 orals; aperture subceu- 

 tral ; ambulacral ap- 

 pendages, but thus far 

 the hydrospires are un- 

 known. Type S. angu- 

 latus. Some authors re- 

 fer this genus to the 

 Palseocrinoidea. 



angulatus, Conrad, 1842, 



Jour. Acad. Nat, Sci., 



vol. 8, p. 279, and Pal. 



N. Y., vol. 2, p. 212, 



Niagara Gr. 

 gemmiformis, Hall, 1852, 



Pal. N. Y., vol. 2, p. 



215, Niagara Gr. 

 osgoodensis, S. A. Miller, 



1879, Jour. Gin. Soc. 



Nat. Hist., vol. 2, p. 



116,NiagaraGr. Wachs- 



muth has said this spe- 

 cies was described from internal casts, 

 but it was not. 

 pentalobus, Hall, 

 1879, (Codaster 

 pentalobus,) 

 Desc. New Spec. 



FOSS., p. 13, and Fl(3 . 434._Htephanocrinus 

 llth Rep. Geo. pulchellus, instead of 



pulchellus, Jour. Gin. Soc. Nat. Hist., 

 vol. 1, p. 35, Niagara Gr. 

 STKHKOCRINUS, Barris, 1879, Proc. Dav. 

 Acad. Sci., vol. 2, p. 282. [Ety. ste- 

 reos, firm; krinon, lily. Distinguished 

 from Dolatocrinus by having 2x5 in- 

 stead of 3x5 primary radials; one large 

 interradial succeeded by a smaller one, 

 and this by smaller ones, within the de- 

 pressions, between the arm bases. Type 

 S. triangulatus. 



triangulatus, Barris, 1879, Proc. Dav. 

 Acad. Sci., vol. 2, p. 283, Up. Held. Gr. 



FIG. 433. Steph- 

 anocrinus angu- 

 latus. 



pulchellus, Miller & Dyer, 1878, (Codaster 



FIG. 435. Strotocrinus perumbrosus. Under side of canopy 

 with calyx broken away. 



triangulatus var. liberatus, Barris, 1879, 

 Proc. Dav. Acad. Sci., vol. 2, p. 284, Up. 

 Held. Gr. 



STROBILOCYSTITES, White, 1876, Proc. Acad. 

 Nat. Sci. Phil., p. 28. [Ety. strobilos, 

 pine cone ; kustis, bladder.] Subspher- 

 ical ; 3 pectinated rhombs, two above 

 the middle and one below ; ovarian ap- 

 erture below the summit; 4 principal 

 arm grooves extending below the mid- 

 dle, and 4 secondary grooves. Type S. 

 calvini. 



calvini, White, 1876, Proc. Acad. Nat. Sci. 

 Phil., p. 28, Devonian. 



STROTOCRINUS, Meek & Worthen, 1866, Geo. 

 Sur. 111., vol. 2, p. 188. [Ety. strotos, 

 spread; krinon, lily.] Calyx bowl- 

 shaped, with vault spreading beyond 

 like a canopy ; basals 3 ; primary ra- 

 dials 3x5; secondary radials 1 or 2 x 

 10, succeeded by tertiary and other di- 

 visions, which, with the interaxillaries 

 and interbrachials, unite to form the 

 under side of a greatly expanded hor- 



