The present paper was originally published in the Proceedings of 

 the Washington Academy of Sciences, vol. in, pp. i-no, March 26, 

 1901. 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 is the same as that of the present volume; the original 

 numbers of the plates are also the same as in the present volume, so 

 that no change has been necessary. The running plate caption has 

 been changed from Proceedings of the Washington Academy of Sci- 

 ences, vol. in, to H. A. E., vol. xi. No other alterations of any 

 kind have been made, save the introduction of the illustration at the 

 top of the first page, in place of the running heading of the Academy's 

 Proceedings, and the change of the title, which was : Papers from 

 the Harriman Alaska Expedition, xx. The Nemerteans. 



The author desires to record the following corrections and additions : 

 Page 3. A summary of the contents of a posthumous paper by Mr. B. B. Griffin 



on the Nemerteans of Puget Sound and Alaska is given on pages 114-118 of 



Part II. This paper antedates Part I of the present report and necessitates 



the following changes in nomenclature : 

 "Carinella speciosa sp. nov." should read Carinella rubra Griffin; pp. 5, 7 



11-14. 

 " Carinella dinema sp. nov." should read Carinella sexlineata Griffin; pp. 5, 8, 



15, 16, 17. 

 " Carinoma griffini sp. nov." should read Carinoma mutabilis Griffin; pp. 5, 8, 



20-23. 



" Amphiporus leuciodus sp. nov." should read Amphiporus imparispinosus Grif- 

 fin; pp.6, 9, 31,51-53,55. 

 "Amphiporus exilis sp. nov." should read Amphiporus formidab His Griffin; pp. 



6, 51-56. 

 Page 8, third line from top, after " surface " add : -while a sixth longitudinal line 



is often indicated along the mid-ventral surface. 

 Page 34, at end of second paragraph add : Stylets are spirally fluted, and appear 



as if braided. See footnote, p. 144. 

 Page 55, at end of last paragraph add : except in Geonemertcs, where Bohmig 



{Zeits.f. wt'ss. ZooL, Ixiv, p. 34^ i8<^8} has found 8 or q ncphridiopores above 



and i or 2 below the lateral netves. 

 Page 82, add : Further notes on coloration and distribution of Cerebratulus albi- 



frons are given in Part II, p. 200. 



EDITOR. 



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