468 HORNERID^E. 



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

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

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

 wanting. 



HORNERA LICHENOIDES, LinnSBUS. 

 Plate LXVII. figs. 1-5. 



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



pi. xiy. figs. D, B. 

 MILLEPORA LICHENOIDES, Linn. Syst. ed. rii. 1283: Strom, Act. Hafn. xii. 



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

 HORNERA FRONDICULATA, Sars, Reise Lof. Finm., Nyt Mag. f. Nat. Vid. vi. 



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

 HORNERA BOREAMS, Busk, Crag Polyz. 95 and 103 : Alder, Quart. Journ. 



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

 HORNERA LICHENOIDES, Smitt, loc. cit. 404 and 469, pi. vi. fig. 10, pi. vii. figs. 



1-14 : Busk, B.M. Cat. iii. 17, pi. rnii. 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 quincuncially 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. Ocecia 

 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 | to f inch ; breadth about the same. 



