A MONOGRAPH OF THE EXISTING CRINOIDS 67 



The great majority of the comatuHds are so very variable both individually 

 and locally that a description of a species which would include mention of all the 

 common deviations from what in the light of our present knowledge seems to be the 

 typical form would be quite impracticable, and not only impracticable but also 

 almost hopelessly confusing. 



The descriptions are therefore drawn up from a representative specimen or 

 several specimens and are followed by notes taken from other individuals. 



The specimens on which notes are given are arranged in geographical sequence 

 corresponding with the sequence in the list of localities following so that local varia- 

 tions and local peculiarities, where such exist, may be readily appreciated. 



The localities are all arranged in a definite order from one extreme of the range 

 to the other. Wlien a locality has already been published the fact is indicated by 

 the name of the author and the date of publication in brackets. All the locaUties 

 have been verified, and in most cases much more information regarding the local- 

 ities is given herein than was given in the original record. If the present author 

 has examined the material upon which a locality record is based, the number of 

 specimens seen by him and their present location is given in parentheses. 



In the case of all species which have been known for a considerable period a 

 short history is appended in order to make their status clear. 



