■REPORT ON THE POLYZOA. 15 



Character. — Zoarium ramose or foliaceous ; zooecia opening only on one side ; ocEcia 

 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) Hornera frondiculata, Lamouroux. 



Hornera frondiculata, Lams., Exp., p. 41, pi. lixiv. figs. 7-9; Milne-Edwards, loc. cit., p. 17, 

 pi. ix. figs, l-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 iuhipora, Ell. and Soil, p. 139, pi. xxxi. fig. 1. 

 Millepora lichenoides, lAnni, Pallas, Esper. 

 1 Hornera affi-iiis, M.-Edw., loc. cit., p. 9, pi. x. fig. 1. 

 1 Hornera andeyavensis, Mich., Icon. Zooph., p. 318, pi. Ixxvi. 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. Ocecia oblong, carinate, ribbed ; aperture 

 tubular, superior. Diameter of branches about 0"6 mm., and of orifice 0'08 mm. 



Habitat. — Porto Praya, St. lago, 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, Pantoppidan, Norg. Natuurb., vol. i. p. 258, pi. xiv. figs. D.E. 



Millepora lichenoides, Linnt, Miiller, Prodr., p. 252, No. 3046 ; Strom, Act. Hafn., vol. lii. 



p. 309, pi. iii. fig. 12; Fabricius, Zool. SammL {teste Smitt), and Fauna Groenl., p. 432 



{nee Pallas). 

 Hornera frondiculata, Sars, Reise, Ldf. oz 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. la. 

 Hornera horealis, Busk, Crag Polyzoa, pp. 95-103 ; Alder, New British Polyzoa, Quart. Joum. 



Micr. Sci., N.S., vol. iv. p. 108, pi. v. figs. 1-6. 

 Hornera lichenoides, Smitt, Kritisk Fortecku., pp. 404, 469, pi. vi. fig. 10, pi. vii. figs. 1-14 ; 



Busk, Brit. Mus. Cat., pt. iiL p. 17. pi. xviii. figs. 5-6 ; Hincks, Brit. Mar. Polyz., p. 468, 



pL Ixvii. figs. 1-5. 



Character. — Zoarium rising from a rather thick furrowed base, branched irregularly ; 

 branches dichotomous, crowded and straggling, often spreading out in a flabeJIiform 



