PALAEOZOIC. 



ECHINODERMATA. 



CAMBEIAN AND SILURIAN. 



CAMBEIAN. LOWEK SIL. UPrER SILURIAN. 



SPECIES. 



Sub- Kingdom, ANNULOIDA, 



Huxley. 



Class, ECHINODEXMATA. 



Anomalocystidj:. 

 Atelocystites Billings, 1858 



Anomalocystites Hall, iS 59 ... 



Placocystites De Koninck, 1869 

 — Forbesianus De Kon 



Rhombifebi. 



Maerocystella Callaway, 1877 



— Marise Call 



TAXOCBINID.E. 

 Myelodactylus ... Hall, 1852 

 Herpetocrinus Salt. 1873.. 

 — Sp N.S(E. 



ASTIBOID.E. 



Pa'aaster Sailer, 1856 .. 



— WyvilleThomsoni... S. Ether. 



ASTEBOID.E. 



Tetraster Ether. % Nich. 1880 



Palaaster Salter, 1856 ... 



— Wyville-Thomsoni E. <$• N. ... 



- Sp 



ASTEBOID*. 



Triehotaster Wright, 1873 



— plumiformia ... Wright 



« 



REFERENCES. 



CYSTOIDEA. 



Placocystites, De Kon. Bull. Acad. Roy. Bruxcllcs, 2 ser. 

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

 t. 7, f. 2-5, 1870; ib. Dec. II, vol. vii, p. 195, t. 6, 

 f. 16-21, 1880; woodcuts, p. 197. Atelo. Flelcheri, Camb. 

 Cat. Addenda, p. xlvii, f. 1-7 ; p. 128, woodcut. 



CYSTOIDEA. 

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



CMNOIDEA. 

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



Mono. Sil. Fobs. Girvan, p. 333, t. 21, f. u, 12. 



Brit. Assoc. Rept. 1856. 

 Vide Tetraster. 



Pala?aster, 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. 



3 F 



401 



