374 P- Kramp. 



Lafoëa serpens does not seem to agree with Ciispidella prociimbens; 

 if they occur together, one of them is always in great preponderance, 

 or the two species keep to separate parts of the hydroid colony or 

 of the leaf of seaweed on which they are growing. 



Hah.: St. 21, 63, 64 a, 68 a, 71a, 72 c, 96, 



Depth: 6— 180 m., most frequent at 20— 60 m. 



Geographical distribution: Arctic: circumpolar. — East 

 Atlantic as far as Cape Verde. Eastern and western coasts of America 

 as far as Tierra del Fuego. Hawaii. 



Not earlier кполуп from East Greenland Ч 



Genus Toichopoma Levinsen. 



Toichopoma oMiquum (Hincks) Levinsen. 



Plate XX, fig. 4. PI. XXIII, figs. 5— 8. PI. XXIV, fig. 1. 



Calycella ohHqua Hincks 1874 [29] p. 149. PI. VI, figs. 4, 5. 



Toichopoma ohliquum Levinsen 1892 [38] ,, 176 & 178. 



Broch 1909 [17] ,, 159 & 210. Textfig. 20. 



This purely arctic species is rather numerous at some few 

 stations in fairly shallow water. The largest colony (St. 71 a) is 

 7.5 cm. high. 



The operculum is formed of the upper part of the wall of the 

 hydrotheca. Its developmental history is the following. In its early 

 stages the hydrotheca looks quite like that in Lafoëa fruticosa, but 

 at a certain period, ere the original, thin roof of the hydrotheca 

 undergoes a change, a curved line appears on the upper part of 

 the hydrotheca, corresponding to the boundary of the later operculum 



> Filelluml^l) expansiim Levinsen (38) p. 172, Tab. VII, Fig. 6— 7, was set up under 

 the reservation, that „det er meget muligt, at de [Rørene] med Tiden ville vise sig 

 at tilhøre en Art af Slægten FolliciiUna eller af en nærstaaende Slægt" ("it is quite 

 possible that they [the tubes] will prove in time to belong to a species of the genus 

 Folliculina or of a nearly related genus"). This species is found in great numbers 

 on leaves of Delesseria and such like from the Danmark Expedition. I have often 

 seen it with the two ciliated lobes characteristic of Folliculina stretched out of the 

 tubes, so that the reference of the species to the genus Folliculina is certain. Levin- 

 sen has asked me to communicate this here. 



Filellum(l} expansum Levinsen will thus take the name: 



Folliculiua expausa (Levinsen). 



It is mentioned as hydroid at the following places: 

 Filellum(4) expansum Levinsen 1893 [39] p. 382. 

 Filellum expansum Hartlaub 1899 [23] p. 113. 

 Lafœa expansa Billard 1907 [11] p. 179. 



Filellum expansum Jäderholm 1909 [35] p. 77, Taf. 7, Fig. 12. 



The species is thus known from: West Greenland (Lev.), North-East Greenland 

 (Danmark Expedition), Spitzbergen (Jäderholm), Kara Sea (Lev.), Denmark (Lev.), 

 Hohusliin, Sweden (Jäderholm). Eastern North Sea (Hartlaub), Cadiz Baj' (Billard). 



