476 LICIIENOPORID,E. 



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, Algae, &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'Intosh) : Hebrides; Shetland, to 170 fathoms (A. M. 

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



GEOGRAPHICAL DISTRIBUTION. Bahusia (Loven) : Nor- 

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

 South Labrador (Packard) : Roscoff, on Eschara (Lepra- 

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



RANGE IN TIME. ?Cor. Crag (S. Wood): Scotch Gla- 

 cial deposits (Geikie) : Postpliocene, Canada (Dawsou). 



2. Colony always simple. 

 a. Zocecia uniserial. 



LlCHENOPORA RADIATA, AudoUUl. 

 Plate LXVIH. fig. 9, 10. 



MELOBESIA RADIATA, Savigny, Egypte ; Audouin, Expl. 235, pi. vi. fig. 3. 



TUBULIPOEA PATINA, M.-Edw. Rechcrclies, Sur les Tubulip. 9, pi. xiii. fig. 1. 



UKICAVEA HADIATA, If Orb. loc. cit. 971. 



? DISCOCAVEA VERRUCARIA, id. loc. cit. 958. 



DISCOPOHELLA FLOScuLus, Hincks, Dev. Cat., Ann. N. H. ser. 3, is. 468, 



pi. xvi. fig. 3. 



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

 DISCOPORELLA RADIATA, Busk, B.M. Cat. iii. 32, pi. xxxiv. fig. 3. 



Zoarium orbicular, bordered with 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 



