Page:VCH Sussex 1.djvu/138

 A HISTORY OF SUSSEX 79. Cellepora ramulosa, Linnasus. Partially encases the stems of corallines. The zocecia are ovate to tubular, with a stout prominence beneath the aperture but not so vertical as in C. pumicosa, and with a rather large avicularium at the base, and upon the inner surface. Very common from the coralline zone. Hastings. CrCLOSTOMATA CRISIIDi^ 80. Crhia cornua, Linnaeus. Colonies forming erect, feather-like growths upon seaweed and corallines. The zooecia are tubular and curved, giving off other zooecia from behind in single series. Near the base of each zooecium there is a horny joint ; and in many cases at the side, and a little way below the aperture, there occurs a long, tapering, curved spine also having horny joints. Common from moderately deep water. Hastings. A variety without spines, but not of Hincks' genlculata type, also occurs some- what rarely at Hastings. 81. Crhia eburnea, Linnaeus. Of similar habit to the last species. The zocecia are biserial and alternate with only the ends free. Horny joints occur at intervals along the stem and branches, but always at the commencement of each branch. The ocecia are pear-shaped, and occupy the position of a zooecium. Crhia ehurnea var. aculeata^ Hassall, with a long jointed spine upon the off-side of the aperture, also occurs, together with the type, at Hastings, both being rather common. 82. Crisia denticulata, Lamarck. Much like the last species, but the zooecia are more compact, not so elongated, aper- tures not so distant, more opposite, and the space between the two lines of zooecia is greater ; the habit moreover is straighter. Not very common. Hastings. TuBULIPORIDy?: 83. Stomatoporagranulata,'WlvQ-Y.AvfzxAi.* Hastings. 84. Stomatopora major, Johnson. A species forming little straggling, irregularly-branching colonies upon rock, shells, etc. The zocecia are tubular and number in the widest part as many as seven abreast, the number increasing with the length of the branch. The anterior ends of the zooecia curve upwards and are free, showing a circular aperture. This occurs either irregularly or, as is often the case, in rows. Not uncommon from mode- rately deep water. Hastings. 85. Entolophora clavata. Busk.* Hastings. 86. TuhuUpora lohulata, Hassall. Encrusting shells, and forming somewhat radiatingly lobed or branching colonies, of a mauve colour. The tubular zooecia are enlarged in the upper part, but contract toward the aperture which is upturned and free. The primary tubes multiply rapidly, producing fan-like expansion of the lobes. From deep water ; somewhat rare. Hast- ings. 87. Tubulipora flahellaris, Fabricius. Forming thin, flat, fan-like colonies upon scallop and other shells. Apertures slightly enlarged and raised. The ooecia are seen as oval expansions occupying the width of three or four zooecia. From deep water ; common. Hastings. 88. Idmonea serpens, Linnaeus. Exquisite, mauve or purple coloured colonies, upon corallines, flustra, etc. The upturned anterior ends of the tubular zocecia occur mainly in rows, upon either side of a central parting. Colonies branch by dividing. Not uncommon from moderately deep water. Hastings. 89. Diastopora patina, Lamarck. Colonies forming little white discs of radiating tubular zocecia, upon stone, corallines, etc. Occasionally colonies take a concave form. Around a small area in the centre the anterior ends of the zooecia are erect and free, but outside remain horizontal and do not rise above the common matrix. Around the edge of the colony is seen the white border of a fine calcareous carpet, spread around for the due reception of the dainty polypides. Rather common from moderate to deep water. Hastings. 90. Diastopora ohelia, Johnston. Encrusting shells, etc. The zocecia radiate from a centre, the apertures being barely elevated above the colonial crust. Lines forming the boundary between the adjacent rows of zooecia, sinuous and distinctly marked. Dotted here and there between the apertures are small tubular orifices, reproducing in miniature the zooe- cial apertures. Very common from deep water. Hastings.