282 



ECHINODERMA TA. 



[si-H.— STK. 



these by three or more ; first azygous 

 plate as" large as the primaries; it rests 

 upon the basals 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 8. nobilis. 

 armosus, McChesney, 1861. (Eucalypto- 

 crinti8 armosus,) New. Pal. Foss., p. 

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

 Hist., p. 373, Niagara Gr. 

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

 bilis,) Geo. 8ur. Wis., p. 21, and 20th 

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

 Niagara Gr. 



Sphxrocrinu8, Meek & Worthen. 1866. The 

 name was preoccupied, by Roemer. 

 See Ceelocrinus. 



Sph.krocystites, Hall, 1859, Pal. X. Y., vol. 

 3, p. 130. [Ety. xphaira, sphere ; kuttU, 

 bladder.] Spheroidal, wider than high ; 

 arms, in two principal pairs, with 

 numerous bifurcations: brachial sulci 

 obliquely lobed ; niuuth apical ; open- 

 ing subapical ; oVarian opening on the 

 summit; basal plates 4, others un- 

 known. Type S. multiiasi-iaius. 

 multifasciatus, Hall, I860, Pal. N. V., 

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



Squamasler, Ringueberg, 1886, Hull. Buf. 

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



Stkganocbinus, Meek & Worthen, 1866, Geo. 

 Sur. 111., vol. 2, p. li>5. [Ety. ttegemtM, 

 covered; kririon. lily.] (ieneral form 

 like Actinocrinus: basals 3; primary 



or^ 



Fie, 429 — Steganocrinus concinnu*. 



radials 3 x 5 ; secondary radials lx2x 

 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. pentagon us. 

 araneolus, Meek & Worthen, 1860. (Acti- 

 nocrinus araneolus,) 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. IS'.*, Bur- 

 lington Gr. 



Fin no Bteganoorlnuapantagonua. Vault and 



pan i>r the rays ; " and </ showing structure of 

 the ra 



(Actinocrinus 

 towa, p. 577, 



rV7S> ' 



pentagon u>. Hall, 1858, 



pentagonus,) Geo. Sur. 



Burlington Gr. 

 sculpt us, Hall, 1866, 



(Actinocrinus sculp- 



tus,) Geo. Sur. Iowa, 



]>. 582, Burling- 

 ton (Jr. 

 Si kmm.vioc kinis, Traut- 



Khold, 1867, Crin. d. 



jungeren Bergkalkea 



b. Moskau, p. 28. 



[Ety. *l? m inn, wreath; 



/•/•//ion, lily.] Calyx 



low, cup-shaped ; 



basals 5, anchylosed ; 



8ubradials5; radials 



twice as wide as 



high ; brachials 1 x 



5; arms heavy. Type 



S. cornuus. This is 



closely related to Kr- 



isocrinus and Kupa- 



chycrinus. 

 trautscholdi, Wachs 



ninth A: Springer, 



1886, Re-vis. Palaeo- 



crinoidea, pt. 3, p. 



L'ot;, Keokuk 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 



Via. 481. — Stegano- 



crinus .seulptus. 

 Diagram of a ray 

 and transverse 

 ■ectlona. 



