THE RECENT CRINOIDS OF THE LEYDEN MUSEUM. 175 
NOTE XII. 
THE RECENT CRINOIDS OF THE LEYDEN MUSEUM 
BY 
AUSTIN H. CLARK. 
During the past summer I visited the Leyden Museum 
for the purpose of examining the types of certain crinoid 
species which are preserved in that institution. Most of 
these species were originally described by Dr. P. Herbert 
Carpenter in 1881 (Notes from the Leyden Museum, vol. 3, 
pp. 171—217), but a few were instituted forty years pre- 
viously by Professor Johannes Müller (Monatsber. d. k. 
preuss. Akad. d. Wiss., Berlin, 1841, pp. 179—189). 
As was to have been expected the discovery of many 
new forms and the greater knowledge thereby gained of 
the specific interrelationships within the group had made 
it necessary to review the material studied by Miiller and 
Carpenter in order to determine more exactly, in the light 
of recently acquired information, just what they had at hand. 
The collection of the Leyden Museum has already been 
discussed in these pages, Carpenter in 1881 having given 
an extended account of it, including redescriptions of all 
of Miiller’s types. The present notes are offered as a sup- 
plement to those previously published by Carpenter, while 
at the same time thé opportunity is taken of recording 
such specimens as have been received since his visit. 
I wish to offer my best thanks to Dr. F. A. Jentink 
and to Dr. R. Horst for their kindness in permitting me 
Notes from the Leyden Museum, Vol. X XXIII. 
