156 



HYDROIDA II 



long as broad, cylindrical, with a curved basal part tapering sharply towards the stalk. The hydro- 

 theca is circular in transverse section near the aperture; the opening margin is furnished with ten to 

 fourteen low, rounded teeth. The basal cavity of the hydrotheca is small; the limit between this and 

 the large main chamber is formed by a low, but often fairly narrow and sharply defined ring-shaped 

 inner thickening of the wall. 



The gonothecse proceed from the tubes of the rhizocaulome, and are attached to the same by 

 an almost rudimentary stalk. They are bottle-shaped, with a broadly rounded basal part, and a short, 

 rather narrow, tubulous neck, as a rule curved or somewhat asymmetrical. 



Material : 



"Ingolf St. 127 66°33' N., 20°05' W., depth 44 fathojns, 5,6°. 

 "Thor" 64°02' N., 22°33' W., depth 34 metres 



— 63°3o' N., 2o°i4' W., — So — 

 Greenland: Davis Strait, depth So fathoms (without further details) 



_ _ , 67°24' N., 55^39' W. (depth not stated). 

 Iceland : Vestmano, depth 49 fathoms. 

 The Faroe Islands: 6 miles N. by W. of Store Kalso, depth 60 fathoms 



Glyversnaes near Thorshavn, together with red algfe (depth not stated). 



Caiiip(U!ularia virticillata is a circumpolar arctic-boreal species, penetrating only slightly to the 

 .south, but still met with off the coast of France. The statements in one or two recent works, how- 



200 m. 600 m. loQO m. . 2 000 m. 



I'lK I.XXXI. The distribution of Campattularia vfrticillnta in the northern Atlantic. 

 In the hatched regions the literature notes a cotumon occurrence. 



