674 



ECHINODERMA TA. 



[AGA. — BAR. 



rupted by the presence of the rays, 

 thus showing the disc has a greater 

 depth than the rays have. Rays nar- 

 row, convex, spine- 

 bearing, and com- 

 posed of plates ar- 

 ranged opposite each 

 other. Ventral side 

 has a deep central 

 disc and ten oral 

 plates. TypeA.gre- 

 garius- Described 

 by Meek and Wor- 

 then as Protaster 



Fig. 1209.— Aganaster 

 gregarius. Dorsal 



greganus. 



nified* arm ' m8g ' Agaricocrinub b 1 a i r i 

 and A. sampsoni, S. 

 A. Miller, 1801'. Advance Sheets 18th 

 v Rep. Geo. Sur. Ind., pp. 20 and 21, 

 Chouteau limestone, and A. chouteau- 

 ensis and A. germanus, pp. 42 and 43, 

 Chouteau limestone, 

 dissimilis, S. A. Miller, 1891, Advance 

 Sheets 17th Rep. Geo. Sur. Ind., p. 55, 

 Keokuk Gr. And also at the same time 

 and place, from the same Group, A. 

 gorbyi and A. indianensis. 

 decornis, Rowley it Hare, 1891, Kansas 

 City Scientist, vol. 5, p. 117, Burlington 

 Gr. 

 splendens, Miller & Gurley, 1890, Jour. 

 Cin. Soc Nat. Hist., vol. 13, p. 18, re- 

 published in 17th Rep. Geo. Sur. Ind., 

 p. 55, Keokuk Gr. 

 Aoelacrinus blairi, S. A. Miller, 1892, Ad- 

 vance Sheets 18th Rep. Geo. Sur. Ind., 

 p. 12, Keokuk Gr. 



Ai.i.ocrinus benedicti, 

 S.A.Miller, 1891, 17th 

 Rep. Geo. Sur. Ind., 

 p. 37, Niagara Gr. 

 Alloprosallocrinus gur- 

 leyi, 8. A. Miller, 

 Fig. 1210. - Aliocri- 1891, 17th Rep. Geo. 

 ti- Sur. Ind., p. 58, Keo- 

 kuk Gr. 



rags' 



Basal view. 



Fig. 1211 — Alloprosallocrlnus gurleyi. Basal 

 and side views. 



Arachnocrinus canadensis, Whiteaves, 

 1891, Cont. to Can. Pal., p. 208, De- 

 vonian. 



Arch^eocidaris legrandensis, Miller & Gur- 

 ley, 1890, Desc. New Gen. and Spec. 

 Echinodermata, p. 59, Kinderhook Gr. 



Ateleocystites, Billings, is probably a good 

 genus, and not a synonym for Anomal- 

 ocystites. In that case, Ateleocystites 

 huxleyi would be the type, and the 



genus may include A. balanoides, which 

 does not seem to belong to Hall's genus 

 Anomalocystites. 

 Barycrinus blairi and B. boonvillensis, 

 S. A. Miller, Bull. No. 4, Geo. Sur. Mo., 

 p. 25, Keokuk Gr. 



Fig. 1212.— Barycrinus princeps. 



latus, Hall, 1861, (Cyathocrinus latus,} 

 Proc. Bost. Soc. Nat. Hist., p. 292, Bur- 

 lington Gr. 



princeps, Miller and Gurley, 1890, Desc. 

 New (Jen. and Spec. Echinodermata, 

 p. 52, Keokuk Gr. 



Fig. 1213.— Barycrinus princeps. Azygous view. 



stellifer, S. A. Miller, 1892, Advance 

 Sheets 18th Rep. Geo. Sur. Ind., p. 46,. 

 Keokuk Gr. 



