ECHINOIDEA. I. 



d'Arcy Thompson (Dundee). By this present I beg to offer my sincerest thanks to all these 

 gentlemen. Finally I had occasion for a short stay at the British Musenm in Augnst 1901. By the 

 genial friendliness of Prof. Bell I was enabled to examine a great many forms, especially original 

 specimens from the Challenger-Expedition. It will appear throughout my work, that this stay has been 

 of material importance to me, and my best thanks are dne to Prof. Bell for his liberality. Still I have 

 to thank Dr. F. A. Bather (British Mnsenm) for his excellent assistance in several literary questions. 



Copenhageu, January 1902. 



The A Uth or. 



