Report on the Hydroids. ' 371 



most cases the gonothecae are firmly bound to each other, forming 

 a "Coppinia", more rarely the connection is of a looser nature; the 

 latter form, "Scapus" , indicates a transition to related forms with 

 separated gonothecae. — Toichopoma obliqiiiim, the gonosome of 

 which is described here for the first time, must be referred to the 

 Lafoëidae, as its gonosome is a typical Coppinia; it is thus the only 

 operculated member of the family. 



Genus Lafoëa (Lamouroux). 

 Lafoëa fruticosa M. Sars. 



Plate XX, figs. 2, 3. 



Campanularia fr. M. Sars 1851 [49] p. 188. 



Lafoëa „ ,, 1862 [50] „ 6. 



„ Hincks 1868 [28] „ 202. PI. 41, fig. 2. 



,. G. O. Sars (i. p.) 1873 [48] „ 114. Tab. IV, fig. 16. 



,. Hincks 1874 [29] ,. 148. PI. VI. 



,, Thompson 1884 [56] ,. 7. PI. I, fig. 17. 



„ Levinsen 1892 [38] „ 171. Tab. VII, Fig. 1—5. 



„ ,, Bonnevie 1899 [13] „ 64. Tab. V, fig. 2 b, 3. 



„ Broch 1906 [16] „ 35. Textfig.4. 



,. Jaderholm 1908 [34] „ 14. PI. II, Fig. 16. 



„ „ ,. 1909 [35] „ 73. Taf.VII, Fig. 9. 



„ Broch 1909 [17] ,, 158 & 208. Textfig. 19. 



Numerous from a great mau}^ stations, but it is only found in 

 great abundance at St. 63, The largest colony (St. 63) is 10 cm. high. 



I have only seen hydrothecae renovated once. — There can be as 

 many as 9 windings on the pedicel of the hydrothecae. — Bridges 

 and coalescences between the branches occur frequently in vigorous, 

 compact colonies (cf. p. 355 — 356). 



Gonosomes fairly frequent (St. 21, 63, 95 a). 



Hab.: St. 21, 63, 64a, 68a, 69, 71a, 72c, 94, 95a, 96, 99, 104b. 



Depth: 6— 300 m. 



Geographical distribution: Arctic : circumpolar, — Greater 

 part of the Northern Hemisphere. 



Lafoëa gracillima (Alder) G. O. Sars. 



Campanularia gracillima Alder 1856 [l]p.l29. PI. VI, figs. 5, 6. 



Lafoëa ,. G. О. Sars 1873 [48] „ 115. Tab. IV, fig. 



19—21. 



fruticosa Hincks 1874 [29] „ 148. PI. VI & VII. 



Thompson 1884 [56] „ 7. PI. I, fig. 18. 



Allman 1888 [9] ,. 34. PI. XVI, fig. 2. 



XLV. 27 



