468 HORNEHIDE. 



be said to include the more typical species, we have an. 

 example in H. lichenoides. In tlie other group, of which 

 H. violacea is a member, the superficial fibrous crust is 

 Avanting. 



HORNERA LICHENOIDES, LiimffiUS. 

 Plate LXVII. figs. 1-5. 



" CoRALLUiiM,'' Pontoppidan, Norges Naturl. Hist. i. 258, nos. 7 and 8, 



pi. xir. figs. D, E. 

 MiLLErORA LICHENOIDES, Liiin. Syst. ed. xii. 1283 : Strom, Act. Hafn. xii. 



(1799), 309, pi. iii. figs. 1, 2. 

 HoRNERA FRONDicuLATA, Sars, Eeise Lof. Finra., Nj-t Mag. f. Nat. Vid. vi. 



146 : Busk, Ann. N. H. ser. 2, xviii. 34, pi. i. fig. 7. 

 HoRNEHA BOREALis, Busk, Crag Polvz. 95 and 103 : Alder, Quart. Journ. 



Micr. Sc. n. ser. iv. (1864), 108, pi. t, figs. 1-6. 

 HoRNERA LICHENOIDES, S'/uiti, loc. cit. 404 and 469, pi. \i. fig. 10, pi. vii. figs. 



1-14 : Busk, B.M. Cat. iii. 17, pi. xviii. figs. 5, 6. 



Zoarium white, rising from an expanded and furrowed 

 base, much and irregularly branched, spreading, often 

 somewhat flabelliform, the anterior surface fibro-reti- 

 culate, with scattered subtubular pores; branches 

 rising from a very short stem, divided and subdivided 

 dichotomously, so as to form somewhat fan-shaped 

 segments, rather stout, very slightly compressed, taper- 

 ing gradually towards the extremities, which are bifid. 

 Zocecia on the front of the branches, immersed or very 

 slightly prominent, the orifices quineuncially arranged, 

 circular, with an even rim — those on the sides produced, 

 expanded obliquely towards their extremities, the mar- 

 gin sometimes carried out into an acute point on one 

 side; dorsal surface traversed by undulating ridges, 

 with minute pores in the intermediate furrows. Ooecia 

 on the dorsal surface, ovate or suborbicular, sometimes 

 very gibbous, reticulate, or coarsely punctate, with a 

 tubular orifice on one side, from which a very slender 

 rib stretches across to the opposite side. 



Height from i to | inch ; breadth about the same. > 



