v iii INTRODUCTION. 



at Belfast. To the Rev. A. M. Norman I am indebted for information 

 respecting several British species. At Liverpool, in company with the 

 curator of the Derby Museum, Thomas J. Moore, the excellent collection 

 of Echinoderms brought together by his care was examined ; it contains 

 numerous interesting species from localities rarely represented in collec- 

 tions. 



At Stockholm, in company with Professor Loven, the booty of the Jose- 

 phine Expedition was carefully examined, and I had also the opportunity 

 of seeing authentic specimens of most of the species described by Scan- 

 dinavian authors, most admirably preserved, as arc all the Invertebrate 

 Collections of the Stockholm Academy, — a model, indeed, to be followed 

 in the system adopted for exhibition. To Professor Lilljeborg I am also 

 indebted for information respecting some of the Echini of Linne, still 

 preserved in the Museum of Upsala. 



At Copenhagen Professor Steenstrup allowed me the freest access to 

 the collections of the University ; and in company with Dr. Liitken I had 

 the opportunity of examining specimens of the species described by him 

 in bis Bidrag, and of improving my acquaintance witb the species of the 

 Norwegian coasts. 



To Dr. G. 0. Sars I am indebted for a complete series of the species 

 of Echini inhabiting the coast of Norway, collected at the Lofoten Islands 

 during his Dredging Expeditions. 



Professor W. Peters and Dr. Martens, of Berlin, most kindly gave me 

 access to the originals of the Echini described by the former from 

 Mozambique, and by the latter from the eastern seas, principally from 

 Japan. 



At Hamburg, Mr. C. L. Salmin and Dr. Schmeltz, the curator of the 

 Godeffroy Museum, gave me the freest access to the materials which 

 interested me, while to Dr. Shilling, curator of the Hamburg Museum. 

 I am indebted for similar favors. 



Through Professor Grube, of Breslau, I have had access to the remark- 

 able Echini he described in 1867, and which have thus far remained 

 unique in the history of Echinoderms. 



In Leipzig, a few interesting species from Australia were shown me 

 by Professor Leuckhart. Professor Kolliker gave me the freest access pos- 

 sible to the collections in his charge, while Dr. Semper allowed me to 

 make a very careful examination of his magnificent collection of Echino- 



