rr » 



j^ANK DIATOMS OF THE ALBATROSS VOYAGES. 229 



tlie science which have been set asi(U^^ in this work for the first time. 



osmma 



the. old name Aulacodiscus for Tripodisciis; the old tuiine Arach- 

 noidisciis for Hemiptychus; the old name Rhabdonema for Tcssclla. 

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

 Pleurosigma anguMum by the hitherto unknown compound here 

 a]>plied to it, Gyrosignta thuringicum. 



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

 together with the many taxonomic questions involved, have de- 

 manded a most careful review of i\w manuscript. This has been 

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

 The task has been accomplished with such accuracy and thorough- 

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

 In exi)ressincT here my thanl« to Mr. Richer for his able cooperation 

 I wish at the same time to state that I hold myself aloue 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 b^'e destitute of diatoms is here omitted. The appended list 



' of staticms 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, ami 



the -cneral position aloug the coast. By referring m this table to 



the stations mentioned under each species all the available data 



re-arding any diatom or any diatomaceous gathering can be secured 



wfthout the text 1.)eing cuuibercd with repetitions. Ihere is also 



addeil a full bibIiogi-ai)hy of works used in preparing this r<^port. 



The purposes of these investigations have been three: 



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



■ plants. „ « 1, • 1 .•/- 1 • 



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



- - • ' -^ 1 i.u'liwliiKT the tvnes of all new 



merate 



.species herein named, for the use of future investigators. 11ns has 

 been placed at their disposal in the Ignited States National Museum. 

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

 tions in this field for the purposes previously discussed— namely, for 

 throwing valuable light upon certain meteorological and geological 

 problems connected with marine investigations. at -v> 



U. S. National Museum, 



Washington, D, C, March, WOO, 



