476 LICHENOPORID^. 



posed, and diminutive systems, offers the most striking- 

 contrast to the last-named; but they are both referable 

 to one and the same specific type. 



Habitat. On corals, Sertularians, shells, Algse, &c., 

 from moderate to great depths. 



Localities. Guernsey ; South Devon ; Cornwall ; II- 

 fracombe; Isle of Man; Rothesay Bay (T. H.) : Northum- 

 berland, not rare (Alder) : St. Andrews, rather rare (Dr. 

 M'lntosh) : Hebrides; Shetland, to 170 fathoms (A. M. 

 N.) : &c. Var. o. Shetland, 80-100 fathoms (C. W. P.). 



Geographical Distribution. Bahusia (Loven) : Nor- 

 way (Lilljeborg) : Finmark (Sars) : Greenland (Liitken) : 

 South Labrador (Packard) : Eoscoff, on Eschar a {Lejn'a- 

 lid) foliacea (Joliet) : France, S.W. (Fischer). 



Range in Time. ? Cor. Crag (S.Wood): Scotch Gla- 

 cial deposits (Geikie) : Postplioccne, Canada (Dawson), 



2. Colony ahvays simple. 



a. Zooecia uniserial. 



LicHENOPORA radiata, Audouiii. 



Plate LXVIII. fig. 9, 10. 



Melobesia radiata, Savignij, Egypte ; Audouin, Expl. 235, pi. vi. fig. 3. 



TuBULiroRA PATINA, M.-Eclw. Eeclierches, Sur les Tubulip. 9, pi. xiii. fig. 1. 



Unicavea radiata, UOrb. loc. cit. 971. 



?DiscocAYEA verrucaiua, id. loc. cit. 958. 



DiscOPORELLA FLOSCuLus, Kmcks, Dev. Cat., Aiin. N. H. ser. 3, ix. 468, 



pi. xvi. fig. 3. 

 DiscosPARSA PATINA, Heller, Bryoz. d. Adr. M. 46. 

 DiscoPORELLA RADIATA, BusJc, B.M. Cat. ill. 32, pi. xxxiv. fig. 3. 



Zoarium orbicular, bordered Avitli a thin, adherent lamina, 

 convex, the centre of the disk flat, destitute of cells, 

 cancellated, the openings of various size and shape, not 

 stellate, frequently 1-3 large, trumpet-shaped, tubular 



