466 TUBULIPOIlIDyE. 



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 Discosparsa 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. flabettum 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). 



