CONT 



Preface 



i 



I. Introductory 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 11 



Section Capitata 11 



Family Corynidae II 



Coryne Gaertner 13 



Coryne Sarsii (Loven) 14 



Loveni (M. Sars) 15 



pusilla Gaertner 16 



— sp. aff. Hincksi Bounevie 18 



Family Myriothelidae 1 s 



Myriothela M. Sars 19 



Myriothela phrygia (Fabrieius) 19 



Family Tuiulariidae 21 



Tu&ularia L i n n e 22 



Tubularia pnlclier ( Ssemundss on ) 22 



— indivisa Li n n e 24 



regalis Boeck 25 



larynx Ellis etSolander 27 



sp. iudet 28 



Corymarpha M. Sars 29 



Corymorpha nutans M. Sars 31 



glacialis M. S ars 32 



groenlandica 1 A 1 1 m a 11 ) 33 



ENTS 



Page 



( 'orymorpha sp. indet 37 



Section Filifera 38 



Family Clavidae 38 



Clara G 111 eli 11 3S 



Clava multicornis (Forskal ) 38 



Mil, •mi Norm an 40 



Merona cornucopiae Norman 40 



Monobrachium M ereschko wsky 42 



Mondbrachium parasitum Mereschkowsky 42 



Family- Bougainvilliidae 43 



Hydractinia van Beneden 44 



Hydraclinia Sarsii St eenstrup 45 



echinata (I'leming) 46 



carica Bergh 48 



Bougainvillia Lesson 49 



Bougainvillia conferta I Aid er) 50 



Perigonimus M. Sars 51 



Perigonimus repens ( \V ri gh t) 52 



abyssi G. O. Sars 53 



roseus ( M. S a rs ) 54 



Family Eudendriidae 56 



Eudendrium Ehrenberg 57 



Eudendrium rameum (Pallas) 57 



ramosum (Linne) 59 



Wrighti Hartlaub 60 



annulatum Norman 62 



capillar,' Alder 62 



418 8 S 



