The recent Crinoids of the Leyden Museum

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 previously 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 Müller and Carpenter in order to determine more exactly, in the light of recently acquired information, just what they had at hand.