The coloured figures are made from preserved specimens ; nevertheless they give an excellent picture 

 also of the living animals, the Echinids, as is well known (at all events with regard to a great 

 number of species), being possessed of the excellent quality often to keep their colour completely in alcohol. 

 — I have had occasion myself to see a great many living Echinids, so that I may have a well- 

 founded opinion of this fact. — Only of Calveria hystrix I have had a coloured sketch, made from the 

 living animal onboard of the < Ingolf ► ; the preserved animal proved to have lost next to nothing of 

 the intensity of its colour. There is therefore good sense in making coloured figures from preserved 

 specimens, especially as we have most frequently to do with preserved specimens by the determina- 

 tions. I have accordinglv thought it very important to have these figures made, and I must here 

 take the opportunity to thank my friend, the artist painter, Mr. Bentzen-Bilk vist, most heartily for 

 the excellent execution as well of the original figures as of the lithographic reproduction of these and 

 of all the other plates. Also the uncoloured habitus figures are drawn by Mr. Bentzen-Bilkvist; 

 all the detail figures are drawn by the author. 



With regard to the enlargement (Obj. and Oc.) of the separate figures it must be noted that 

 where nothing else is stated, a Seibert's microscope has been used; when a Zeiss's microscope has been 

 used, it is specially stated. 



