Tlie colonred figures are made from preserved specimens ; uevertheless they give an excellent picture 

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

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

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

 founded opinion of this faet — Only of Calvcria hystrix I have had a colonred 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 colonr. There is therefore good sense in making colonred fignres from preserved 

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

 tions. I have accordingly thonght it very important to liave these fignres made, and I mnst here 

 take the opportnnity to thank niy friend, the artist painter, Mr. Bentzen-Bilkvist, most heartily for 

 the excellent execution as well of the original fignres as of the lithographic reprodnction of these and 

 of all the otlier piates. Also the nncolonred habitns figures are drawn by Mr. Bentzen -Bilkvist; 

 all the detail fignres are drawn by the author. 



With regard to the enlargement (Obj. and Oc.) of the sejsarate fignres it mnst be noted that 

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

 nsed, it is specially stated. 



