CERIANTHARIA. 



(7) Cerianthus damelsseni Ronle. 



(8) CerianthusJ lloydii Ronle = C. roulei n. n. 



Of these Cerianthus lloydii shews the widest geographical distribution known, Greenland, 

 Spitsbergen, Nova Zembla, the Norwegian coast, the west coast of Sweden to The Sound, North Sea, 

 the coasts of Great Britain. The range of distribution of C. borealis according to Parker (1900) is 

 from the Arctic Ocean to Cape Hatteras. Pachycerianthus multiplicatus is known only from the Katte- 

 gat and the fjord of Trondhjem. Arachnanthus sarsi and Botrucnidifer norvegicus only from the 

 fjord of Trondhjem in Norway. C. vogti only from a district lying west of the fjord of Trondhjem 

 and westward of Lofoten (C. abyssorum\ Roule's Cerianthus daniclsseni is taken to the westward 

 of Iceland and near Lofoten in Norway, and C. roulei is only known from Spitsbergen. After this 

 general survey of the forms, I pass on to describe the species which I have investigated. 



Section II. 

 Description of species. 



Family Cerianthidae. Diagnosis see Section III. 

 Genus Paehyeerianthus Roule. Diagnosis see Section III. 



Species P. multiplicatus nov sp. PI. i, 2. 



Syn.: Cerianthus membranaceus Liitken 1889 p. 362. 



danielsseni p.p., Levinsen 1893 p. 397. 



Diagnosis: A large species with 160 170 long marginal tentacles. The directive chamber and 

 the contiguous chamber on either side of this probably without labial tentacles. Stomatodaeum of 

 medium length. Siphonoglyph not wide, with insertions for( 6 jnesenteries. Hyposulcus short, with 

 quite long, very narrow, but distinct hemisulci. The directive mesenteries very short The proto- 

 mesenteries 2 and 3 short, the former somewhat longer than the latter. Protomesenteries 2 sterile 

 with region of the ciliated tract and cnido-glandular tract The metamesenteries arranged distinctly 

 in quartettes. The metamesenteries of the first cycles (M) very long extending to the aboral pole of 

 the body with prolonged ciliated tract region and numerous cra'spedonemes reaching as far as the 

 most aboral portion of the mesenteries, with very slight cnido-glandular region, fertile. The craspe- 

 donemes are most numerous and longest in the lowest part and here form not very distinct bunches. 

 The metamesenteries of the 2nd cycle (m) short, of much the same length as the protomesenteries 

 2 and 3, with craspedonemes as with M and somewhat stronger cnido-glandular region, fertile. The 

 metamesenteries of the 3rd (B) and 4th (b) cycles very short, corresponding in structure with proto- 

 mesenteries 3, with insignificant craspedonemes and well developed cnido-glandular region, sterile, those 

 of the 4th cycle somewhat shorter than those of the 3rd. 



