PKEEATOKY XOTE. 



At the time the plates for this volume were prepared, it was intended 

 that the descriptions we had already published in the Proceedings of 

 the Philadelphia Academy of Natural Science should be thoroughly 

 revised before publication in this report, and that all the species, 

 especially of crinoids, already described by others, and now illustrated 

 from far better specimens than those originally studied by the authors 

 of the species, should also be thoroughly described and their affinities 

 discussed ; but owing to the unfortunate illness of Mr. MEEK, I have 

 been deprived of his assistance in thus preparing the whole for the 

 press, and my own time being otherwise employed, we have been com- 

 pelled to depart from the original design, and to republish many of the 



descriptions without revision. 



A. H. WORTIIKN. 



