my material by Giard and Bonnier (the genus Clypeoniscus G. and B.). Those authors had 
just previously described an Epicarid living as a parasite on Ampelisca diadema Costa. 
What I had found on Idotheidse tempted me to go on looking for Epicaridea, so I examined 
our Ampeliscidee and found — not these forms, — but several species of Choniostomatidee 
as well as another most remarkable parasite, which I described in 1892 under the name of 
Rhizorhina Ampelisce H. J. H. Professor Sars has told me (1886) that he had found some 
species of Spheronella on Amphipoda. Now, as my own discoveries had called forth my 
interest, I began in the Copenhagen Museum an examination of the material of Amphipoda 
and later on of the other orders of Malacostraca. 
Professor G. O. Sars lent me all his material of this family for my researches, and 
he further provided me with newly discovered forms — seven in all, — of which four are 
particularly interesting; two of the most remarkable genera, the parasites on Myside, are 
owing entirely to him — for all of which I have great pleasure in offering the eminent 
naturalist my best thanks. — The Rev. Canon A. M. Norman, F. R. 8., lent me the types 
of Aspidoecia Normani Giard and Bonnier, and the Rey. Th. R. R. Stebbing, F. R. S., 
determined for me some Amphipoda from the Mediterranean, the West-Indies, the Cape and 
Hong-Kong, for which I beg these gentlemen to accept my thanks. 
Last, not least, I wish to express my warm gratitude to the managing Committee 
of the Carlsberg Fund for having allowed me a considerable sum to defray the expenses of 
the present work. 
The English translation from the Danish manuscript is the work of Miss Louise 
yon Cossel. 
