Pi 
THE ANNALS \4w 
AND 
MAGAZINE OF NATURAL HISTORY. 
[EIGHTH SERIES.] 
No. 120. DECEMBER 1917. 
XLVIII.—British Fossil Crinoids—XJI. Balanocrinus of 
the London Clay. By F. A. Baruer, D.Sc., F.R.S. 
(Published by permission of the Trustees of the British Museum.) 
Brrore considering the somewhat obscure and relatively 
rare stem-fragments of Pentacrinidae found in the London 
Clay of England, it Will be well to examine the corresponding 
fossils that are both abundant and well-preserved in the 
Nummulitic rocks of Biarritz. The horizon from which 
the crinoid stems are there obtained is uow regarded as the 
base of the Bartonian. Among the associated fossils are 
Serpula spirulaea, Nummulites variolarius, and the nummu- 
. lite pair N. contortus et striatus. 
Some specimens collected at the Port des Barques, 
Biarritz, by my friend Professor Jules Welsch, were recently 
submitted to me by my esteemed correspondent Dom 
Aurélien Valette, who desired my opinion on certain 
observations that he had made on them. Since the facts to 
which he directed my attention have for some thirty years 
past been demonstrated in the exhibited series of fossil 
crinoids at the British Museum (Natural History), 
mentioned in the ‘ Guide to the Fossil Invertebrate Animals” 
(1907 & 1911], p. 63), it- seems advisable to publish them 
in more accessible and more extended form. Similar facts 
Ann. & Mag. N. Hist. Ser. 8, Vol. xx. 26 
