CONTENTS. 



Ceriantharia. 



Page 



Introduction i 



Literature and survey of the northern Ceriantharia 3 



Description of species 5 



Family Cerianthidae. Pachycerianthus multipUcatus n. sp 5 



Cerianthus lloydii Gosse II 



— vogti Dan 18 



Ceriantheopsis (n. gen.) americanus (Verr.) 22 



Famil}- .\contiferidae. Arachnanthus in. gen.) sarsi n. sp 27 



Family Botrucnidiferidae. Botrucnidifer (n. gen.) norvegicus n, sp 30 



Larval forms. Arachnactis albida Sars 34 



Classification of the Ceriantharia 37 



(Corianthas valdiviae n. sp.) 44 



Morphology' 48 



Arrangement of tentacles 48 



Stomatodaeuni, siphonoglyph, hyposulcus, hemisulci 49 



Arrangement of mesenteries 5° 



Mesenterial musculature 53 



Orientation of body 54 



Mesenterial filaments r:%_. 59 



c.Acontia • 68 



Botrucnidae 7^ 



Bibliography 77 



