CONTENTS 



P.ge 



1'rt-face 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 II 



Family Corynidae II 



Coryne Gaertner -. . 13 



Coryne Sarsii ( I,o yen ) 14 



Lovcni (M. Sars) 15 



pusilla Gaertner 16 



sp. aff. Hincksi Bonnevie 18 



Family Myriothelidac 18 



Myriothela M. Sars 19 



Myriothela phrygia (Fabricius) 19 



Family Tubulariidae 21 



Tubularia Linne 22 



Tubiilaria pulcher (Ssemundsson) 22 



indivisa I/inne 24 



regalis Boeck 25 



larynx Ellis et Solander 27 



sp. indet 28 



Corymorpha M. Sars 29 



Corymorpha nutans M. Sars 3' 



glacialis M. S ars 32 



groenlandica ( All man) 33 j 



Corymorpha sp. indet 37 



Section Filifera 38 



Family Clamdae 38 



Clava G m e 1 i n 38 



Clava multicornis (Forskal) 38 



Merona Norman 40 



Merona cornucopiae Norman 40 



Monobrachium Mereschko wsky 42 



Menobrachntm parasilum Mereschko wsky 42 



Family BoHgmtnUiidae 43 



Hydractinia van Beneden 44 



Hydractinia Sarsii St eenstrnp 45 



echinata (Fleming) 46 



carica Bergh 48 



Bougaimiillia Lesson 49 



Bougainvilha conferta (Alder) 50 



Perigonimus M. Sa rs 51 



Perigonimus repens (Wright) 52 



abyssi G. O. S a rs 53 



roseus ( M. Sars) 54 



Family Eudendriidae 56 



Eudendrium Ehrenberg 57 



Eudendrium rameum I Pall a s) 57 



ramoium ( Li n n 6) 59 



Wrighti Hartlaub 60 



annulatum Norman 62 



capillare Alder 62 



