A MONOGRAPH OF THE EXISTING CRINOIDS O 



Ptilocrinus and the type species Pt. pinnatus were described, and an unfortunate 

 confusion of names in the genus Bathycrinus rectified by the substitution of the name 

 Bathycrinus australis for the Bathycrinus aldrichianus of the Challenger report, which 

 is not the original Bathycrinus aldrichianus of Sir Wyville Thomson, the latter being 

 called by Carpenter Bathycrinus campbellianus. 



Ptilocrinus pinnatus had been collected by the Albatross in 1890, and I had come 

 across it in looking over the undetermined material stored in the United States 

 National Museum. Immediately after my return, and while I was busily engaged 

 in preparing a report upon the birds which I had collected and observed, Mr. Frank 

 Springer had, unknown to me, visited the Museum and had borrowed some of the 

 specimens for study in connection with his work on the fossil species. He at once saw 

 that he had found a remarkable new crinoid type, and it happened that his letter 

 asking permission to describe it and the letter from the Bureau of Fisheries transmit- 

 ting my manuscript reached the Museum at the same time. As soon as he learned 

 of the coincidence Mr. Springer, with his characteristic generosity, withdrew his 

 request. 



In a third paper, published on the same date as the two preceding, all the speci- 

 mens of Eudiocrinus varians and E. japonicus which had been collected in the summer 

 of 1906 were recorded, and a new species, E. tuberculatus, was described, which had 

 been collected by the Albatross in Japan in 1896 and which I found in the collections 

 of the National Museum. At the end of the paper a list of all the known species of 

 Eudiocrinus [that is, Eudiocrinus + Pentametrocrinus] was given. 



On September 17, 1907, two papers were published in which a number of new 

 species of comatulids from the North Pacific were described. 



The new species in the first of these were the following : 



Decametrocrinus borealis. Antedon serratissima. 



Antedon rara. Antedon mariae. 



Antedon hartlaubi. Antedon hondoensis. 



Antedon tenelloides. Antedon clio. 



Antedon asperrima. Antedon erythrizon. 



Antedon perplexa. Antedon fragilis. 



Antedon laodice. Antedon tenuis. 



Antedon eschrichtii maxima. Antedon ciliata. 



Antedon inexpectata. Antedon isis. 



Antedon rathbuni. Antedon arctica. 



Antedon brachymera. Antedon briseis. 



All but two of these were stated in the introduction to have been collected on 

 the 1906 cruise of the Albatross, but in the text Antedon arctica is recorded as having 

 been collected by Maj. Gen. A. W. Greeley in 1886, and Antedon inexpectata, A. 

 perplexa, A. asperrima, and A. serratissima were said to have been dredged by the 

 Albatross in 1888, 1889, 1890, and 1891. The discrepancy is explained by the fact 

 that three of these descriptions were added while the paper was going through the 

 press. 



