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PTILOCRINUS ANTARCTICUS n. Sp., à crinoid dredged by the 
Belgian Antarctic Expedition; by F. A. Bather, British 
Museum (Natural History), London. 
Material. — N° 589. Three specimens : A. Crown 
on column. B. Crown and column, broken. C. Smaller 
crown, abnormal, with portion ‘of column. N° 688, two 
columns of the same, dried. AÏl from Faubert VII, 8 Octo- 
ber 1898; 82 47’ W. Greenwich, 70° 23’ S. Depth, 
not actually given, circa 480 metres. Colour in life, « Fla- 
vus brillant ». Colour in spirit, yellowish brown. 
These clearly belong to a species allied to Péilocrinus 
pinnatus A. H. Clark (1) from the North Pacific. Clark 
gave no diagnosis of Piilocrinus, nor did he assign it to 
any Family or even Order. The details given by him 
leave some important points doubtful, and the material 
at my disposal has not enabled me to clear them up en- 
tirely. Clark did, however, state that his species was 
« closely related » to Calamocrinus Diomedae À. Ag., and 
this seems justified. Calamocrinus has hitherto been 
regarded as one of the Apiocrinidae, but it has not been 
directly proved to be pseudo-monocyclic. The discovery 
of Ptilocrinus seems to link Calamocrinus rather to the 
Crinoidea Monocyclica. Pending decisive evidence, the 
generic diagnosis has been drawn up so as to distinguish 
Ptilocrinus from the known genera of both series. 
(4) Proc. U. S. Nat. Mus., n° 1547, vol. XXXII, p. 551, 15 June 1907. 
