PALiKOZOIC. 



ECHINODEBMATA. 



CAMBEIAN AND SILURIAN. 



CAMBEIAN. LOWBB SIL. 



TTPPEE SILTJEIAN. 



SPECIES. 



Sub-Kingdom, ANNULOIDA, 



Huxley. 



Class, ECSINODEMMATA. 



Anomaioctsted^. 

 Atelooystites Billings, 1858 



AnomalocystUes Sail, 1S59 ..'. 



Placocystites Be Koninck, 1869 

 — Forbesianns De Kon 



RHOMBrFKEI. 



MacrocTstella Callamay, 1877 



— Marise Call 



Taxoceinid«. 

 Myelodaotylus ... Sail, 1852 

 Serpetocrinus Salt.iSf^.. 

 — Sp N.4-E. 



ASTBBOIDiE. 



Palaaster Salter, 1856 .. 



— WyviUe-Thomsoni... S. lEther. 



ASTEEOID.S.' 



Tetraster JEfher. (Sf Nich. 1880 



FaltBoster Salter, 1856 .. 



— WyviUe-Thomsoni E. ^ N 



- Sp 



ASTEBOID^. 



Trichotaster Wright, 1873 



— plumifonnis ... WrigM 



|3 



pq 



3 F 



REFERENCES. 



CYSTOIDEA, 



Placocystites, De Eon. Bull. Acad. Roy. Bruxelles, 2 ser. 

 vol. xxviii, p. 57-65; ib. Geol. Mag. vol. vii, p. 260, 

 t. 1 f. 2-5, 1870; ib. Dec. II, vol. vii, p. 195, t. 6, 

 f. 16-21, 1880J woodcuts, p. 197. Atelo.Fletchsri, Ca.mb. 

 Cat. Addenda, p. xlvii, i. 1-7 j p. 128, woodcut. 



CYSTOIDEA. 

 Q. J. Geol. Soc. vol. xxxiii, p. 670, t. 24, f. 13. 



CEINOIDEA. 

 Pal. New York, vol. ii, p. 191. 



Mono. Sil. Foss. Girvan, p. 333, t. 21, f. 11, 12. 



Brit. Assoc. Rept. 1856. 

 Vide Tetraster. 



Palseaster, Salter et Auct. (non J. Hall). 



Mono. Sil. Foss. Girvan, p. 324, t. 21, f. 1-8. 

 Mono. Sil. Foss. Girvan, p. 325, t. 21, f. 9, 10. 



Mono. Brit. Echino. Pal Soc. vol. xxxiv, p. 169. 



401 



