. Bulletin of the British Museum (Natural History). ON THE POLYZOAN GENUS CREPIDA CA NTHA LEVINSEN 257 Diagnosis. Crepidacantha with the ovicell flattened and deeply immersed in the distal zooecium, the uncalcified area of the ectooecium occupying almost the whole of the exposed frontal surface. Vibracula placed proximally to the orifice, the flagella short and directed laterally inwards. A small sub-oral tubercle present. Proximal lip of orifice squared, plate-like. Marginal spines of mature zooecia short and thick, of marginal zooecia long and flexible.^ Description. Zoarium encrusting. Zooe
. Bulletin of the British Museum (Natural History). ON THE POLYZOAN GENUS CREPIDA CA NTHA LEVINSEN 257 Diagnosis. Crepidacantha with the ovicell flattened and deeply immersed in the distal zooecium, the uncalcified area of the ectooecium occupying almost the whole of the exposed frontal surface. Vibracula placed proximally to the orifice, the flagella short and directed laterally inwards. A small sub-oral tubercle present. Proximal lip of orifice squared, plate-like. Marginal spines of mature zooecia short and thick, of marginal zooecia long and flexible.^ Description. Zoarium encrusting. Zooecia ovate, arranged somewhat irregularly in radiating rows, scarcely separated by shallow furrows. Orifice sub-circular distally with a shallow poster separated by inconspicuous condyles, the proximal lip square and plate-like. Peristome thin, scarcely raised. Frontal wall usually flattened, occasionally ventricose, finely perforate and covered with small papillae, a small, sub-oral tubercle often present. Marginal spines of mature zooecia short and thick, eight in number, those of the young zooecia long and O QSmtn. Fig. 3. C. kirkpatricki, sp. nov. Holotype, , Recent: Port Phillip Heads, Victoria. Vibracula paired, placed proximally to and on each side of the orifice, the short flagella directed obliquely laterally inwards. Ovicelh large, sub-circular in outline, deeply immersed in mature zooecia, the exposed frontal surface flattened and occupied almost entirely by a porous entooecium, the calcified ectooecium marginal. Measurements. L^ = o-35-o-40 mm. ; l^ = o-25-o-28 mm. h, = o-og-o-io mm. ; /^ = o-oy-o-oS mm. Remarks. The holotype is part of the material described by Kirkpatrick (18886 : 14) as Lepralia Poissonii, Audouin. I have also examined the specimen described by Levinsen (1909 : 268) as Crepidacantha poissoni var., which was kindly lent by Dr. P. L. Kramp of Universitetets Zoologiske Museum, Copenhagen, and this proves to be a small fr
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Keywords: ., 1955, boo, bookauthorbritishmuseumnaturalhistory, bookcentury1900
