CONTENTS 



I. Comparative anatomy of the nourishing individuals, and 



systematic division of the thecaphore hydroids i 



II. Thecaphore Hydroids of the Northern Atlantic 6 



Family series Hebellina 6 



Family Lafttidtc 6 



Lafcea (Lamourouxj 7 



Laftea dumosa (Fleming) 7 



gracillima (Alder) 9 



fruticosa M. Sars 12 



Toichopoma Levinsen 15 



Toichopoma obliquum ( H i n cks | 15 



Grammar ia (Stimpson) 16 



Grammaria serpens ( Hassall ) 16 



conferta (Alhnan) 17 



abietina (M. Sars) 18 



immersa Nutting 22 



Lictorella (Allman) '.. 22 



Lictortlla pinnata ( G. O. Sars ) 22 



Zygophylax Quelch 24 



Zygophylax biarmata Billard 24 



Family Campanulinida 25 



Subfamily Cuspidellinte 26 



Stegopoma Levinsen 26 



Stegopoma plicatile ( M. Sars) 26 



Cuspidella. Hincks 29 



Cuspidella humilis H i n cks 29 



Lafoeina M. Sars 29 



Lafoeina maxima Levinsen 3 



Campanulina van Beneden 30 



Campanulina turrita Hincks 3 1 



Subfamily Calycellino: 32 



Cafyfella (Hincks) 3 2 



Calycella syringa (Linne) 3 2 



Tftrapoma Levinsen 34 



Tetrapama quadridtntatum (Hincks) 34 



Family series Haledina 35 



Family Haleciida 35 



Halecium Ok en 35 



Halecium halecinum (Linne) 3<> 



Beanii Johnston 3^ 



scutum Clark 39 



furvieaule v. Lorenz 41 



Page 



HalfCium muricatum (-Ellis and Solander). . . . 43 



labrostim Alder 45 



tenellum Hincks.. 46 



minutum B r o c h 50 



Family Plumulariida 51 



Kirckenpaufria (Jickeli) 52 



Kirchenpaueria pinnata (Linne) 53 



Plumularia (Lamarck) 55 



Plumularia setacea (Linn^) 55 



Catharina Johnston 56 



Polyplumaria G. O. S a rs 58 



Polyplumaria frutrscens (Ell is and Solander) . 59 



fiabellata G. O. Sars 59 



profunda (Nutting) 60 



Nemertesia Lamouroux 62 



Ncmtrtesia antennina (Linne) 64 



ramosa Lamouroux 66 



Polynemertesia nov. gen _. 69 



Polynemertesia gracillima (G. O. Sars) 70 



Family Aglaopheniida 72 



Halicornaria (Busk) 72 



Halicornaria campanulata (Ritchie) 72 



Ncmatocarptis nov. gen 74 



Nematocarpus ramuliferus (Allman) 74 



Aglaophenopsis ( Fe w kes ) 77 



Aglaophenopsis cornuta (Verrill) 77 



(?) pharetra nov. sp 80 



Cladocarpus Allman 82 



Cladocarpus integer (G. O. Sars) 82 



formosus Allman 85 



Diana nov. sp 87 



bicuspis ( G. O. S a rs ) 89 



Thecocarpus Nutting 91 



Thfcocarpus myriophyllum (Linne) 92 



Agtaophenia (Lamouroux) 93 



Aglaophenia tuhulifera Hincks : 93 



Family series Sertulariina 94 



Family Sertitlanidte 94 



Serlularella Gray 96 



Sertularella tamarisca (Linne) 96 



tricuspidata (Alder) 98 



amphorifera Allman 100 



