The following paper on the Bryozoa of the Expedition, by Miss 

 Alice Robertson, of the University of California, was originally pub- 

 lished in the Proceedings of the Washington Academy of Sciences, 

 vol. u, pp. 315-340, Oct. 10, 1900. It is here reprinted from the 

 same electrotype plates, so that it may be quoted exactly as if it were 

 the original. The original pagination has been preserved and trans- 

 ferred to the inner or hinge side of the page, where it is enclosed in 

 brackets, thus [316] ; while the consecutive pagination of the present 

 volume has been added in the usual place. In the plates the orig- 

 inal number and running headline, slightly abbreviated, have been 

 preserved [in brackets], while the volume designation and serial plate 

 number have been added in the usual place. The original text refer- 

 ences to the plates are unchanged. The present headpiece and title 

 have been substituted for the running heading of the Academy's Pro- 

 ceedings and the original title, which was : Papers from the Harri- 

 man Alaska Expedition. VI. The Bryozoa. No other alterations 

 have been made. 



The author desires to record the following corrections : 



Page 240 [332], fourth line from top, for Ballyell ' read Dalyell. 

 Page 242 [334], second line from bottom, for Filaridan ' read Floridan. 

 Throughout the paper, wherever the words ' zoecia,' ' zcecium,' ' zoecial,' ' oecia,' 

 and ' cecium ' occur, insert o before the diphthong. 



EDITOR. 



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