LAFOEA DTJMOSA. 



201 



Fig. 23. 



The erect form rises into bushy tufts. The calycles are 

 of stout, firm material, and retain their shape when dried ; 

 they are sometimes distant, sometimes crowded together 

 on the upright stem and branches. 



The variety robusta (Woodcut, fig. 23) was at one time 

 regarded by Sars as a species ; 

 but he subsequently changed 

 his opinion, on finding a form 

 intermediate between it and 

 the normal dumosa. 



The stems are composed of 

 more numerous tubes than 

 in the common form, and the 

 calycles are somewhat shorter 

 and thicker. 



I have obtained this very 

 striking variety, which was dredged by Sars near the North 

 Cape in 30-50 fathoms, from the Coast of Cornwall. It 

 has a very distinctive habit of growth. 



The whole of the ccenosarc in L. dumosa, as well as the 

 polypite, is of a delicate sulphur-colour. 



Hab. On various marine bodies from the littoral region 

 to very deep water : very common and generally distri- 

 buted. Dredged by Capt. Beechey, off the Mull of Gallo- 

 way, in 145 fathoms, and the only hydroid found at this 

 depth. 



[Coasts of Norway (Christiania, Bergen, &c.)(Sars): (var. 

 robusta) North Cape, 30-50 fath. (Sars): Labrador, Cateau 

 Harbour, Long Island, not common (A. S. Packard, jun.) : 

 Nova Scotia (teste A. Agassiz) : Massachusetts Bay (A. 

 Agassiz) .] 



