282 



ECHINODERMA TA. 



[SPH. STE. 



these by three or more ; first azygous 

 plate as large as the primaries; it rests 

 upon the basal.s and is succeeded by 

 three plates ; the following ranges have 

 more plates and cover an expanded 

 azygous side ; vault very large, high, 

 and bears a proboscis either projected 

 upward or recumbent ; surface of plates 

 ornamented. Type S. nobilis. 

 armosus, McChesney, 1861, (Eucalypto- 

 crinus armosus,) New. Pal. Foss., p. 

 95, and 20th Rep. N. Y. St. Mus. Nat. 

 Hist., p. 373, Niagara Gr. 

 nobilis, Hall, 1861, (Glypt^crinus no- 

 bilis,) Geo. Sur. Wis., p. 21, and 20th 

 Rep. N. Y. St. Mus. Nat. Hist., p. 328, 

 Niagara Gr. 



Sphteroerinus, Meek & Worthen, 1866. The 

 name was preoccupied, by Roemer. 

 See Coelocrinus. 



SPH.SROCYSTITES, Hall, 1859, Pal. N. Y., vol. 

 3, p. 130. [Ety. sphaira, sphere ; kustis, 

 bladder.] Spheroidal, wider than high ; 

 arms, in two principal pairs, with 

 numerous bifurcations; brachial sulci 

 obliquely lobed ; mouth apical ; open- 

 ing subapical ; ovarian opening on the 

 summit; basal plates 4, others un- 

 known. Type S. multifasciatup. 

 multifasciatus, Hall, 1859, Pal. N. Y., 

 vol. 3, p. 130, Low. Held. Gr. 



Squamaster, Ringueberg, 1886, Bull. Buf. 

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



STEGANOCRINUS, Meek & Worthen, 1866, Geo. 

 Sur. 111., vol. 2, p. 195. [Ety. steganos, 

 covered ; krinon, lily.] General form 

 like Actinocrinus ; basals 3 ; primary 



QtV 



KIG. 429 Steganocrinus coucinnu*. 



radials 3x5; secondary radials 1 x 2 x 

 5, in each ray; regular interradials 3 to 

 6x4; azygous interradials 3 to 10 or 

 more ; vault elevated, with long sub- 

 central tube; arms bifurcating; column 

 round. Type S. pentagonus. 

 araneolus, Meek & Worthen, 1860. (Acti- 

 nocrinus araneolu?,) Proc. Acad. Nat. 

 Sci. Phil., p. 387, and Geo. Sur. 111., 

 vol. 2, p. 198, Burlington Gr. 



concinnus, Shumard, 1855, (Actinocrinus 

 concinnus,) Geo. Sur. Mo., p. 189, Bur- 

 lington Gr. 



FIG. 430 Steganocrinus pentagon us. Vault and 

 part of the rays ; a and d showing structure of 

 the rays. 



pentagonus, Hall, 1858, (Actinocrinus 



pentagonus,) Geo. Sur. Iowa, p. 577, 



Burlington Gr. 

 sculptus, Hall, 1858, 



(Actinocrinus sculp- 

 tus,) Geo. Sur. Iowa, 



p. 582, Burling- 

 ton Gr. 

 STEMMATOCRINUS, Traut- 



schold, 1867, Grin. d. 



jungeren Bergkalkes 



b. Moskau, p. 28. 



[Ety. Bfemmo. wreath ; 



krinon, lily.] Calyx 



low, cup-shaped ; 



basals 5, anchylosed ; 



subradials 5 ; radials 



twice as wide as 



high ; brachials 1 x 



5; arms heavy. Type 



S. cornuus. This is 



closely related to Er- 



isocrinus and Eupa- 



trauSoUH, Wachs. ^t^s^t- 

 mum cv Springer, Diagram of a ray 

 1886, Revis. Palteo- 

 crinoidea, pt. 3, p. 

 256, Kenkuk Gr. 

 STENASTER, Billings, 1858, Can. Org. Rem., 

 Decade 3, p. 77. [Ety. stenos, narrow ; 

 aster, star.] Disk small, rays extended, 

 flexible ; dorsal side covered with small 



and transverse 

 nectio 



