CONTENTS 



Page 



Preface i 



I. Introductory- Notes 3 



a. The Hydroiil Gouophores bearing on classification . 4 



b. The comparative anatomy of the nourishing individ- 

 uals and the system of the athecate hydroids .... 7 



II. Athecate Hydroids of the northern Atlantic 11 



Section Capitata II 



Family Corynidiw II 



Coryne Gaertner 13 



Corync Sarsii iLoven) 14 



— Loveni (M. Sars) 15 



— pitsiUa Gaertner 16 



— sp. aff. Ilincksi Bonne vie iS 



Family Myriothelidaf 18 



Myriothela M. Sars 19 



Myriothela phiygia ( F a b r i c i u s ) 19 



Family Tuiulariidac 21 



Tubtdaria L i n n e 22 



Tuhularia pulcher ( S ffi m u n d s s o n ) 22 



— indh'isa L i n n e 24 



— rcgalis Boeck 25 



— larynx Ellis ct S o 1 a n d e r 27 



— sp. indet 28 



Corymorpha M. Sars 29 



Corvmorpha nutans I\I. Sars 31 



— glacialis M. S ars 32 



— groenlandica ( A 1 1 in a n ) 33 ] 



Pagt 



Corymorpha sp. indet 37 



Section Filifera 38 



Family Clavidae 38 



Clava G m e 1 i n 38 



Clava inulticornis (Forskal) 38 



Meroiia Norman 40 



Merona cormicopiae Norman 40 



Monobrachiutn M eres chko wskv 42 



Monobrachinm parasitiim M ereschk o\v sky .... . 42 



Family Bougainvilliidae 43 



Hydractinia v a n B e n e d e n 44 



Hydractinia Sarsii Steenstrup 45 



— cchinata (Fleming) 46 



— car tea Bergh 4S 



Boiigainvillia Lesson 49 



Bougainvillia confer ta (Alder) 50 



Perigoninuts M. Sars 51 



Pen'gonimtis repens ( AV ri gh t) 52 



— abyssi G. O. Sars 53 



— roseus ( JI. S a rs ) 54 



Family Eudendriidae 56 



Etidfiidrium E h r e n b e r g 57 



Eudiiidrinm ramcum (Pallas) 57 



— rainosum ( Li n u e) 59 



— Jf>/^r/,// Hartlaub . 60 



— anniilatum Norman 62 



— capillare Alder 62 



