CONTE 



Page 



Preface I 



I. Iiitroductorj- Notes . , 3 



a. The Hydroid Gonophores 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 II 



Section Capitata II 



Family Corynidae 11 



Cor^K^ Gaertn er 13 



Coryne Sarsn (Loven) 14 



— Loveni (M. Sars) 15 



— piisilla Gaertner 16 



— sp. aff. Hincksi Bonne vie 18 



Family Myrwthelidae 18 



Myriothela M. Sars 19 



Myriothela phrygia (Fabricius) 19 



Family Tubulariidae 21 



Tubularia Linne 22 



Tiibidaria pulcJier (Saem undsson ) 22 



— indivisa Linne 24 



— regalis Boeck 25 



— larynx El lis et Solander 27 



— sp. indet 28 



Corynwrpha M. Sars 29 



Corymorpha nutans M. S a rs 3' 



— glacialis M. S ars 32 



— groenlandica ( A 1 1 m a n ) 33 | 



NTS 



Page 



Corymorphii sp. indet 37 



Section FUifera 38 



Family Clavidae 38 



Clava G ni e 1 i n 38 



Clava multicornis ( F o r s k a 1 ) 38 



Merona Norman 40 



Merona cornucopiae Norman 40 



Moitoirac/u'um M eres chko wsky 42 



Alonohrachhttti^parasititm M ercschko wsky 42 



Family Bougainvilliidae 43 



Hydractinia v an B e n e d e n 44 



Hydraciinia Sarsii Steenstrup 45 



— echinata (Fleming) 46 



— cnr/cff B e r g h 48 



Bougainvillia L,esson 49 



I : Bougainvillia conferta (Alder) 50 



Perigoniinus M. S a rs 51 



Perigonimus repots ( W ri gh t) 52 



— abyssi G. O. Sars S3 



— rosc-us ( M. S a rs ) 54 



Family Etidendriidae 5^ 



Eudcndrium Ehrenberg 57 



Eiidcndriiim rameum (Pallas) 57 



— ramosum (Linne) 59 



— VVrighti H artlaub 60 



— anmilatum Norman 62 



— capillare .V 1 d e r 62 



