BRITISH ZOOPHYTES. 103 



" are placed at a regular angle of 45 degrees from the 

 stem, and so exactly proportionable is the distance of 

 these branches from one another, that though they are 

 placed alternately with respect to each other, yet the 

 whole has at first sight the appearance of a herring 

 hone. The tubes in the stems grow nearly parallel to 

 each other, and in some one may count in a transverse 

 section above one hundred." — Ellis. The calycles often 

 consist of a number of tubular pieces fitted into each 

 other, " marking the successive generations of poly- 

 pites." 



2. H. MURiCATUM, E. and S. 



Sertularia muricata [E. and S., JEsper, Jameson, 

 Tart., Stew., Bosc, Hogg, Be B.), Laomedea muricata 

 (Lamx.), Campanularia muricata {De B.), Thoa muri- 

 cata {R. Q. a, G. J.), 



Hab. : Wick, Firth of Forth {G. W. P.), Loch Ryan 

 (D. L.), Northumberland {Aid.), Whitby {Hincks), 

 Giant's Causeway {Has.), Montrose Bay {A. 8. P.). 

 Height 2—3 in. 



This species is of a very coarse, rugged appearance. 

 The stems and main branches are composed of agglu- 

 tinated tubes. The gonothecfe are " globular, full of 

 points from crested ribs, which sit on footstalks and 

 arise from root-like tubes." — E. and^ 8. 



Dr. David Skene, of Aberdeen, first discovered this 

 species. It has been called the " Sea Hedgehog 

 Coralline." 



3. H. Beanii, Johnston. 

 Thoa Beanii {G. J.). 



Hab. : Common on shells and other zoophytes. 

 Height 2—6 in. 



" This species is more slender and graceful than II. 



