BRITISH ZOOPHYTES. 305 



This species differs from the preceding in colour, 

 being tinged with violet. It also lacks the reticular 

 markings of II. lichenoides, and has the zooecia longer 

 and more crowded. The ovicels are placed in the 

 axils of the branches, and are punctate. 



FAMILY IV. LICHENOPORID^. 



Zoarium discoid, simple or composite, adnate, or 

 jpartially free and stipitate. Zooecia tubular, erect or 

 suherect, disposed in more or less distinct series, which 

 radiate from a free central area; the intermediate 

 surface cancellated or porous, — T. H. 



Genus I. Lichenopora, Defrance. (From XeLxnv, 

 lichen.) 



Zoarium discoid, raised, simple or composed of many 

 confluent discs, entirely adnate, or partially free, and 

 sometimes stipitate, developed on a thin lamina, which 

 usually forms a border round it. Zooecia distinct or 

 connate, in single radiating lines, or multiserial. — T. H. 



1. L. HispiDA, Fleming. Plate XXII. fig. 8. 



Discopora hispida {Flem., Be BL, Hassall, G. J., 

 R. Q. C), Tubulipora hispida {G. J., B. L.), Discoporella 

 hispida {Gray, Bush, Smitt, Sars, Alder, A. M. N.), 

 Discocavea aculeata (B'Orb.), Heteroporella hispida 

 {T. H.), Tabulipora orbiculus {Lamh., Be BL). 



Hab. : Guernsey, Devon, Cornwall {T. H.), North- 

 umberland (Alder), St. Andrews (IIcL), Weymouth, 

 Shetland (A.M.N.). 



This species forms white, calcareous, and very solid- 

 looking crusts from ^ to | in. in diameter. The crust 

 is sometimes very thick, and looks " like a piece 

 of embossed velvet." — Couch. The zooecia are tubular, 

 arranged in radiating series. The orifices are promi- 



X 



