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 6633' N., 2OO5' W., depth 44 fathoms, 5,6. 

 "Thor" 6402' N., 2233' W., depth 34 metres 



63 3 o' N., 20i4' W., 80 



Greenland: Davis Strait, depth 80 fathoms (without further details) 



, 6y24' N., 5539' W. (depth not stated). 

 Iceland : Vestmano, depth 49 fathoms. 

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



Glyversnses near Thorshavn, together with red algse (depth not stated). 



Campanularia verticillata 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, ho\v- 



60 



200 m. 600 m. louo m. 2 ooo m. 



Fig. LXXXI. The distribution of Campanularia verticillata in the northern Atlantic. 

 In the hatched regions the literature notes a common occurrence. 



