LIST OF TABLES . . V

INTRODUCTION . . 1
Abbreviations . . 2
History of Primnoid Octocorals from the Aleutian Islands . . 3
Acknowledgments . . 4

MATERIAL AND METHODS  . . 4

SYSTEMATIC ACCOUNTS . . 4
Subclass OCTOCORALLIA . . 4
Order ALCYONACEA . . 4
Suborder CALCAXONIA Grasshoff, 1999 . . 4
Family PRIMNOIDAE Milne Edwards, 1857 4
Genus Thouarella Gray, 1870 . . 4
Thouarella cristata, new species . . 5
Thouarella trilineata, new species . . 6
Genus Plumarella Gray, 1870 . . 7
Subgenus Plumarella (Plumarella) Gray, 1870 . . 7
Plumarella (P.) spicata Nutting, 1912 . . 7
Plumarella (Dicholaphis) Kinoshita, 1907, new subgenus rank . . 9 
Key to the Species of the Subgenus Plumarella (Dicholaphis) . . 10
Plumarella (D.) profunda, new species . . 10
Plumarella (D.) hapala, new species . . 11
Plumarella (D.) aleutiana, new species . . 11
Plumarella (D.) superba (Nutting, 1912), new combination . . 13 
Plumarella (D.) nuttingi, new species . . 14
Plumarella (D.) echinata, new species . . 15
Plumarella (D.) robusta, new species . . 16
Genus Fanellia Gray, 1870 . . 16
Fanellia compressa (Verrill, 1865) . . 17
Fanellia fraseri (Hickson, 1915) . . 18
Genus Primnoa Lamouroux, 1812 . . 19
Primnoa pacifica Kinoshita, 1907  . 19
Primnoa pacifica van willeyi Hickson, 1915 . . 19
Primnoa wingi Cairns and Bayer, 2005 . . 20
Genus Arthrogorgia Kiikenthal, 1908 . . 20
Arthrogorgia utinomii Bayer, 1996 . . 20
Arthrogorgia kinoshitai Bayer, 1952 . . 21
Arthrogorgia otsukai Bayer, 1952 . . 22
Genus Calyptrophora Gray, 1866 . . 22
Calyptrophora laevispinosa Cairns, 2007 . . 23
Genus Parastenella Versluys, 1906 . . 23
Parastenella doederleini (Wright and Studer, 1889) . . 24
Parastenella ramosa (Studer, 1894) . . 24
Parastenella gymnogaster Cairns, 2007 . . 25

FIGURES 1-17 . . 27
APPENDIX: STATION LIST . . 45
REFERENCES . . 49
INDEX . . 53