REPORT ON THE POLYZOA. 
15 
Character : — Zoarium ramose or foliaceous ; zooecia opening only on one side ; ooecia 
dorsal or anterior. 
§ a. Ramosa. — Zoarium branched, branches free or rarely inosculating, cylindrical 
or subcompressed. 
§§ a. Ocecia dorsal ; anterior surface of branches reticulato-fibrillate. 
(1) Horner a frondiculata, Lamouroux. 
Hornera frondiculata, Lamx., Exp., p. 41, pi. lxxiv. figs. 7-9; Milne-Edwards, loc. cit., p. 17, 
pi. ix. figs. 1-lc.; Blainville, Man. d’Actin., p. 419; Heller, Adriat., p. 124; Busk, Brit. 
Mus. Cat., pt. iii. p. 17, pi. xx. figs. 1, 2, 3, 6 ; Manzoni, Waters. 
Millepora tubipora, Ell. and Soil, p. 139, pi. xxxi. fig. 1. 
Millepora lichenoides, Linne, Pallas, Esper. 
1 Hornera affinis, M.-Edw., loc. cit., p. 9, pi. x. fig. 1. 
1 Hornera andegavensis, Mich., Icon. Zooph., p. 318, pi. lxxvi. fig. 8. 
Hornera serrata et tubulosa (?), Meneghini, loc. cit., p. 10. 
Character. — Branches tapering, ramifying more or less in one plane, cylindrical or 
subcompressed ; anterior surface strongly fibro-reticulate, divided into rhomboidal spaces 
in which are situated the orifices of the zooecia, surrounded with numerous small pores. 
Orifice exserted, usually bifid ; dorsal surface coarsely reticulate, granular or nearly 
smooth, with small elongated pores in the sulci. Ooecia oblong, carinate, ribbed ; aperture 
tubular, superior. Diameter of branches about 0’6 mm., and of orifice 0'08 mm. 
Habitat. — Porto Praya, St. Iago, Cape de Verde, 100 to 120 fathoms. 
[Mediterranean, Adriatic (very abundant). Fossil in the Crag and Upper Tertiaries 
of Sicily, &c.] 
(2) Hornera lichenoides, Linne (sp.). 
Corallium, Pontoppidan, Norg. Natuurl., vol. i. p. 258, pi. xiv. figs. D.E. 
Millepora lichenoides, Linne, Muller, Prodr., p. 252, No. 3046 ; Strom, Act. Hafn., vol. xii. 
p. 309, pi. iii. fig. 12; Eabricius, Zool. Samuil. ( teste Smitt), and Fauna Grosnl., p. 432 
( nec Pallas). 
Hornera frondiculata, Sars, Reise Lof. og Finm., Nyt Magazin f. Nat.-Vid., t. vi. p. 146 ; Busk, 
Ann. and Mag. Nat. Hist., ser. 2, vol. xviii. p. 34, pi. i. fig. 7 a. 
Hornera borealis, Busk, Crag Polyzoa, pp. 95-103; Alder, New British Polyzoa, Quart. Journ. 
Micr. Sci., N.S., vol. iv. p. 108, pi. v. figs. 1-6. 
Hornera lichenoides, Smitt, Kritisk Forteckn., pp. 404, 469, pi. vi. fig. 10, pi. vii. figs. 1-14 ; 
Busk, Brit. Mus. Cat., pt. iii. p. 17. pi. xviii. figs. 5-6; Hincks, Brit. Mar. Polyz., p. 468, 
pi. lxvii. figs, 1-5. 
Character. — Zoarium rising from a rather thick furrowed base, branched irregularly; 
branches dichotomous, crowded and straggling, often spreading out in a flabelliform 
