Vili INTRODUCTION. 
assistance from Dr. Danielssen of Bergen, Dr. Sturm of Trondhjem- 
fjord, and Prof. Quennerstedt of Lund. In these inquiries, as in so 
many of which Echinoderms have been the subject, I owe a special 
debt of gratitude to my venerable friend Prof. Lovén for advice, 
assistance, and the gift or loan of numerous specimens. 
The names of donors of specimens are in all cases given ; when 
the column is left blank it is to be understood that the specimens 
were acquired by purchase. 
F. JEFFREY BELL. 
British Museum (N. H.), 
8th November, 1892. 
