HYDROIDA II 



173 



Bonneviella grandis (Allman) Broch. 



1876 Campanularia grandis, Allman, Diagnoses of new Genera and Species, p. 259, pi. 12, figs. 2-3. 

 1899 Lafoea gigantca, Bonnevie, Den norske Nordhavs-Expedition, p. 68, pi. 6, fig. 2. 

 1909 Bonneviella grandis, Broch, Hydroidenuntersuchungen, II, p. 198. 



The colonies form enormous upright and irregularly branched rhizocaulomes. From the tubes 

 proceed hydrotheca stalks of differing length, often segmented, with a spherical swelling immediately 

 below the hydrotheca. The latter are twice to three times as long as broad, swollen for the lower 

 third part, somewhat narrower above, with expanded margin; in transverse section, the hydrotheca 

 is circular below, oval nearer the aperture; the aperture itself is as a rule somewhat asymmetrical, 

 the margin quite smooth. The basal cavity is small, bounded at the top by a quite thin diaphragm. 



The gonothecae proceed from the tubes of the stem; they are more or less closely set, and 

 occur scattered about all over the colony. The gonothecae are egg-shaped to spindle-shaped with six 

 to eight longitudinal ribs and a short, narrow trumpet-shaped neck. 



Material : 



Iceland: 64i7,5' N., i444' W., depth 75 meters 5i2 

 The Faroe Islands: Thorshavn (depth not stated). 



The genus Bonneviella includes several species from the northern Pacific, for the further de- 

 scription of which we are indebted to Nutting (1915 p. 95). One of these species is Bonneviella 



200 m. 



boom 



1000 m. 



.__ zooom 



Fig. LXXXIX. Localities of Bonneviella grandis in the Northern Atlantic. 



