466 tubulipoeidyE. 



is remarkably constant, and there is none of the indefi- 

 niteness in the mode of growth which we find in kindred 

 forms. Regularity seems to be the prevalent characteristic. 

 In the original account of this species in the ' Crag 

 Polyzoa/ the tubes are described as '^ not flattened in 

 front/^ and this character is insisted upon as important. 

 In the third part of the British-Museum Catalogue, how- 

 ever, they are merely stated to be '^ deeply and entirely 

 immersed," and there is no reference to their convexity. 

 In the form here intended the flatness of the cell is a 

 marked character. 



Mr. Waters has pointed out that the Dlscosparsa sim- 

 plex of D'Orbigny belongs to this genus, and that Busk^s 

 name cannot be retained. There is too much doubt as to 

 the identification with Reuss^s D. flahellum to allow of the 

 substitution of his name ; and the only course therefore 

 seems to be to give it a new one. 



Habitat. On shells and stones from shallow to deep 

 water. 



Localities. South Devon, abundant ; Isle of Man 

 (T. H.) : Beaufort Dyke, 110-145 fms. (Capt. Beechey) : 

 Macgilligan, Ireland (W. T.,fide Busk). 



Geographical Distribution. Naples, 2-6 fathoms 

 (Waters) : Bahusia; Finmark (Loven) : Kara Sea (Stux- 

 berg & Theel) : Greenland (Liitken) . 



Range in Time. Coralline Crag, on shell (S, Wood). 



