MANN- DIATOMS OF THE ALBATROSS VOYAGES. 2l ,( .> 



the science which have beer set aside in this work for the first time. 

 Thus would be preserved the old name Pleurosigma for Gyrosigma; 

 the old name Aulacodiscus for Tripodiscus; the old name Arach- 

 noidiscus for Hemiptychus; the old name Rhabdonema for Tessella. 

 It is little short of vandalism to call that universally known diatom 

 Pleurosigma angulatum by the hitherto unknown compound here 

 applied to it. Gyrosigma thuringicum. 



The large number of citations to diatom literature in this report, 

 together with the many taxonomic questions involved, have de- 

 manded a most careful review of the manuscript. This has been 

 undertaken by Mr. P. L. Eticker, of the Department of Agriculture. 

 The task has been accomplished with such accuracy and thorough- 

 ness as to greatly increase the value of these portions of the report. 

 In expressing here my thanks to Mr. Kicker for his able cooperation 

 J wish at the same time to state that I hold myself alone responsible 

 for any errors in identification or any untenable positions in tax- 

 onomy that may here occur. 



The long list of stations at which the material obtained has been 

 found to be destitute of diatoms is here omitted. The appended list 

 of stations will be found to give the exact location of each station by 

 latitude and longitude, the sea temperature at the surface and at the 

 bottom, the depth in fathoms, the character of the sea bottom, and 

 the general position along the coast. By referring in this table to 

 the stations mentioned under each species all the available data 

 regarding any diatom or any diatomaceous gathering can he secured 

 without the text being cumbered with, repetitions. There is also 

 added a full bibliography of works used in preparing this report. 



The purposes of these investigations have been three: 



First. That of contributing to the systematic study of this group of 

 plants. 



Second. That of affording a collection of carefully identified speci- 

 mens of all species here enumerated, including the type- of all new 

 species herein named, for the use ^i' future investigators. This has 

 been placed at their disposal in the United State- National Mus< 



Third. That of calling attention to the value of further investiga- 

 tions in this held fur the purposes previously discussed — namely, for 

 throwing valuable light upon certain meteorological and L r e"l' ■_ 

 problems connected with marine investigations. 



Albert Maw. 



U. S. National Museum, 



Washington, D. C, March. t906. 



