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 A HISTORY OF SUSSEX Cellulariid^ 5. Scrupocellarla scruposa^ Linnaeus. Growing in little white branching tufts upon rock, etc. The branches consist of two rows of alternating zooecia, both rows facing in the same direction. The zooecia are ovately tubular, but taper downwards slightly, and the apertures are armed above with three or four spines. Upon the outer side of each zooecium is a prominent avicularium with beak upturned. No oper- culum. From moderate to deep water. Common. Hastings. 6. Scrupocellarla scrupea. Busk. Similar to the last species, but with a non-foliated operculum, and with a flagel- late chamber situated between and rather behind the zooecia. Upon sponges, etc. From moderate depth. Hastings. 7. Scrupocellarla reptans, Linnaeus. A species of prostrate, straggling habit, and of a dull bufF or grey colour. Around the upper margin of the aperture there are three or four spines, and guarding the open- ing there is a foliated operculum. An avicularium is situated sometimes in front, and sometimes there is a smaller one be- hind the spines upon the outer side. Not uncommon upon Jlustra, etc. Hastings. BlCELLARIID^ 8. Bicellaria ciliata, Linnaeus. Colonies form plumose tufts of about I inch in height, of a dull grey colour, and hang pendent, like little tassels, upon the sides of the rocks, at low water. The stem and branches consist of biserial, alter- nating, glassy zocecia, with many and long spines around the apertures, below and rather on the outer sides of which is situ- ated a highly formed avicularium. The zoarium is a very beautiful object under the microscope. Common. Hastings. 9. Bugula avicularia, Linnaeus. Stem about 2 inches in height, giving off branches forming a delicate and beauti- ful spiral. The zooecia are biserial and have a spine at the outer and upper corner, but only a very rudimentary one at the inner corner. The avicularia are longer than in B. turhinata^ but not so prolonged as in Hincks' figures, and are placed mid- way down the aperture. Not uncommon upon rocks at low tide. Hastings. 10. Bugula turbinata, Alder. Growth very much resembling the above species, but there are from two to five zooecia abreast in a division, with a large spine at each of the upper corners of the aperture, and the aperture extends to the zooecium below. The avicularia are shorter and wider than in B. avicularia and are placed just below the spines. Washed ashore. Hastings. 1 1 . Bugula Jiaiellata, Thompson. A short, brown, truncate-looking growth. In some parts the zooecia number seven in a row. There are two spines at each of the upper corners of the zocecia, and often there is an avicularium half way down the side of the aperture. Common upon Flustra foliacea. Hastings. 12. Bugula calathus, Norman. This species resembles very closely B. JtahellatOy but the habit is more compact and shorter. There are five or more zooecia in a row, and in many cases three, but generally two spines in each of the upper corners. Hincks calls attention to the difference in colour between this species and the last. His observations hold good as regards the Hastings specimens, they being of a very pale buff colour. Washed ashore. Hastings. 13. Bugula plumosa, VaWas,.* Not uncommon. Hastings. 14. Beania mirabilis, Johnson. A minute and delicate species creeping over rock, etc. The zooecia are somewhat spoon-shaped, laterally compressed, with numerous spines around the margin, and connected together by prolongations from the preceding zooecia. Common upon rock from the Diamond Ground. Hast- ings. NoTAMIIDil 15. Notamia bursar ia, Linnaeus. This exquisite little species throws up plume-like stems, much curled, and branch- ing. The zooecia are arranged in biserial and opposite order. Above each of these there projects from the stem a pedunculated avicularium. Upon weed ; rather rare. Hastings. CELLARIIDiT 16. Cellaria fistulosa, L' n?eis. Zooecia lozenge-shaped, arranged around a branching, jointed axis. The zoarium is white, and often occurs in dense bush-like masses. From moderate to deep water ; rather common. Hastings. 86