PALAOZOIC, 
SPECIES, 
CAMBRIAN. LOWER S 
ECHINODERMATA. 
IL. 
UPPER SILURIAN. 
St. David’s. 
Lingula Flags, 
Tremadoc. 
Har. 
| Meneevian. 
=i 
‘Llandeilo. 
Low. Llandovery. J 
Caradoe or Bala. 
Up. Llandovery. 
| Woolhope Lmst. 
Arenig 
— = 
| 
| 
+ 
an 
a 
| 
| 
od 
iS) 
| 
G) 
ea 
4 
) 
4 
a 
o 
= 
| Tilest. & Passage. 
Aymestry List. 
| Pass up. 
“Upper Ludlow. 
Lower Ludlow. 
J 
Sub-Kingdom, ANNULOIDA, 
Huxley. 
Class, ECHINODERMATA. 
ANOMALOCYSTID. 
Atelocystites Billings, 1858 
Anomalocystites Hall, 1859 
Placocystites De Koninck, 1869 
RHOMBIFERI. 
TAXOCRINIDE. 
Myelodactylus .., Hail, 1852 
Herpetocrinus Salt. 1873 
ASTEROID. 
— Wypville-Thomsoni... R. Ether. 
ASTEROID. 
Salter, 1856 ... 
— Wyville-Thomsoni 2. & N. ......)...]...}...].0...|e0].. 
SDemeccrrace onobnbacosacondsancdticeboan cool bod fo= 
Paleaster ...... ... Salter, 1856 ...|...|...].. 
— Forbesianus...,,. De Kon.......... asl eel oat 
Spee hie re (ale 
Ether. & Nich. 1880|...|_.|... 
ASTEROID®. 
Trichotaster .,.,.. Wright, 1873 
— plumiformis .,. Wright 
CAMBRIAN AND SILURIAN. 
REFERENCES. 
CYSTOIDEA, 
Placocystites, De Kon. Bull. Acad. Roy. Bruxelles, 2 ser. 
vol. xxviii, p. 57-65; ib. Geol. Mag. vol. vii, p. 260, 
t. 7, £. 2-5, 1870; ib. Dec. II, vol. vii, p. 195, t. 6, 
f. 16-21, 1880; woodcuts, p. 197. Atelo. Fletcheri, Camb. 
Cat. Addenda, p. xlvii, f. 1-7; p. 128, woodcut. 
CYSTOIDEA, 
Q. J. Geol. Soc. vol. xxxiii, p. 670, t. 24, £. 13. 
CRINOIDEA, 
Pal. New York, vol. ii, p. 191. 
Mono. Sil. Foss. Girvan, p. 333, t. 21, f. 11, 12. 
Brit. Assoc. Rept. 1856. 
Vide Tetraster, 
Palzaster, 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, Io. 
.| Mono. Brit. Echino. Pal. Soc, vol. xxxiv, p. 169. 
eine Se Se ea ee 401 
ayy 
