REPORT ON THE POLYZOA. 25 



open, usually disposed in irregular wavy lines radiating from the centre. (Sometimes 

 gemmiparous, Hincks). 



Habitat. — Off Nightingale Island, Tristan da Cunha, 100 to 150 fathoms. 



[British and Irish Coasts, northern and southern; North Sea, Arctic Ocean, 5 to 10 

 fathoms, on Fucus, Flustra, &c., and on shells and coral from 50 to 100 fathoms, 

 Smitt ; coast of Norway, Loven ; Shetland, Barlee, 1 70 fathoms ; Adriatic, Heller ; 

 South Labrador ; Marseilles, Marion ; Eoscoff, Joliet.] 



Family V. LiCHKN0PORrD.a;. 



tAchenoporids, Smitt, Hincks, &c. 



LHscoporadx, Bk., Engl. Cyclop. 



Caveidx (pars), d'Orbigny. 



Tuhigeridx (pars), d'Orbigny. 



Discoporellidx, Bk., Brit. Mus. Cat., pt. iii. p. 30, 1875. 



Character. — Zoarium discoid, simple or confluent ; adnate or substipitate, iuter- 

 zocecial spaces cancellate (cancelli sometimes obsolete). Zocecia erect or suberect, 

 disposed more or less regularly in series diverging from an open central area. 



The Family here contains ; — 



1. Lichenopora. 



(1) Lichenopora Jimbriata, Bk. 



(2) Lichenopora hispida, Flem. 



1. Lichenopora, Defrance. 



Madrepora (pars), Fabr., Esper. 



Lichenopora, Defrance (1823), Blainville, Michelin, Smitt (1878), Hincks, Brit. Mar. Polyz., 



p. 471. 

 Diseopordla, Gray, Brit. Mar. Ead. ; Busk, Crag Polyzoa, and Brit. Mus. Cat., pt. iii. p. 30; 



Smitt, Kritisk Forteckn., p. 405 (1865). 

 Diseopora (pars), Flem. (non Lamk), Busk, Engl. Cyclop. Polyz. 

 Tubulipora (pars), Johnst., M.-Edw., <S:c. 



Defrancia (pars), AcliTiopora, Discocavea, Unieavea, &c., d'Orb. 

 Eeteroporella sp., Hincks. 



Character. — Zoarium sessile, usually closely adnate, with a thin calcareous border ; 

 discoid, raised in the centre (hemispherical, conical, or subconical). Zooecia partly free, 

 disposed irregularly or in lines radiating from the centre. Mouth acuminate or 

 toothed. 



(ZOOL. OHALL. EXP. — PART L. — 1886.) Ddd 4 



