J g HYDROIDA II 



genus Thujaria, as I have already (1909 p. 222) placed it. The same genus, however, has formerly 

 been made to include Serhilaria ardica Allman and Scrtularia arctica Thompson, which is incorrect 

 The proper method of proceeding here will be to alter the name of the present species, as being of 

 later date, and this I have accordingly done, naming it, from the variable character of the branches, 

 Thujaria variabilis. 



Thujaria variabilis has only occasionally been found in arctic waters near Beeren Island, at 

 Spitzbergen and off the Murman Coast at 38 to 86 metres' depth. Reydarfjord thus represents the 

 most southerly find, and is also, with its 80 fathoms, the deepest. 



Thujaria lonchitis (Ellis and Solander) Fleming. 



1786 Sertularia lonchitis, Ellis and Solander, The natural history of many curious and uncommon 



Zoophytes, p. 42. 

 1828 Thujaria articidata, Fleming, A History of british animals, p. 545. 

 nee 1766 Scrtularia articiilata, Pallas, Elenchus Zoophytorum, p. 137. 



1847 Thujaria arlicitlata. Johnston, A History of the British Zoophytes, p. 84, pi. 18, figs. 3—4. 

 neciSsi — — Busk, A list of Sertularian Zoophytes and Polyzoa from Port Natal, Algoa 



Bay . . . ., p. 119. 

 1868 — — pars, Hincks, A History of the British Hydroid Zoophytes, p. 277, pi. 60. 



1874 — — G. O. Sars, Bidrag til Kundskaben om Norges Hydroider, p. 106. 



1884 — lonchitis. Kirchenpauer, Nordische Gattungeu und Arten von Sertulariden, p. 24, pi. 14, 



fig- 7- 

 (nee 1884 — articiilata, Kirchenpauer, 1. c. p. 26, pi. 14, fig. 8.) 

 nee 1888 — pcctinata, Allman, "Challenger" vol. 23, p. 69, pi. n, fig. i. 

 1890 — lonciiitis, Marktanner-Turneretscher, Die Hydroiden des k. k. naturhistorischen Hof- 



museums, p. 236. 

 ^893 — — Levinsen, j\Ieduser, Ctenophorer og Hydroider, p. 53. 



J 899 — articulata pars, Bonnevie, Den norske Nordhavs-Expedition, p. 84. 



1904 — lo7ichitis^ Nutting, Sertularidae, p. 66, pi. 9, figs. 5—8. 



1909 — kolaensis.^ Jaderholm, Northern and Arctic Invertebrates, p. 88, pi. 8, figs. 17 — 18. 



?i909 — lonciiitis^ Jaderholm, 1. c. p. 89, pi. 9, fig. 3. 



1909 — ^ Broch, Die Hydroiden der arktischen Meere, p. 174. 



The upright colonies are as a rule piimate throughout their entire length, more rarely with a 

 spirally coiled distal part of the monosiphonic stem. In the pinnate portion of the colonies, the broad 

 plane of the branches is vertical, in the spiral horizontal; the branches form almost a right angle with 

 the stem, which is dark in colour. The stem is segmented in its lower part, but in the upper, the 

 segmentation becomes almost entirely effaced; the branches are subalternately to alternately set. The 

 stem has two rows of Indrotheca;; between two successive branches on the same side of the stem 

 there will be two to three, rarely more (up to five) hydrothecte, the lowest in the angle of the branch. 

 The branches are not generally ramified, but may more rarely exhibit secondary dichotomous ramifi- 



