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Show 1896.] BRITISH HYDROIDS AND MEDUSJE. 461 results with hydroids and medusae have been obtained when specimen has been killed by a fixing reagent, and then placed first into a 2\ p. c solution and finally into a 5 p. c solution of formaldehyde. I owe my sincere thanks to Professor Weldon for allowing me the use of a table in his Eesearcb Laboratory at University College, and for the aid and kind advice which he has so often generously given. To Mr. E. J. Allen, Director of the Marine Laboratory at Plymouth, I am indebted for his kiuduess in arranging expeditions for the collection of specimens during my visit to Plymouth. PART I. -HYDEOIDS AND THEIB MEDUSA. (HYDROIDA G-YMNOBLASTEA.) In the first part of these notes the Medusae come under their hydroid names, and are arranged according to Allman's classification. The synonyms are divided into two sets : the first set contains the names given to the hydroid form, and includes, also, the references to the medusa whilst attached to the hydroid, or reared from the hydroid in confinement. The second set of synonyms refers only to free-swimming medusae taken in the sea, which have been usually described under other names. Fam. SYNCORYNIDJE. GEMMARIA IMPLEXA (Alder). Tubularia implexa, Alder (1857). Coryne pelagica, Alder (1857). Coryne briareus, Allman* (1859). Coryne implexa, Wright (1859) ; Alder* (1861). Zanclea implexa, Allman* (1864) ; Hincks* (1868). Gemmaria implexa, Allman* (1872); Haeckel* (1879). * Eeferences marked with an asterisk denote that medusa-buds upon the hydroid are also referred to. Two specimens of the medusa were taken at Plymouth on Aug. 31st, 1895. Both were about 1 mm. in diameter, and corresponded to the figures given by Allman in his monograph. The hydroid form has not yet been recorded for the South of England. The medusa of Gemmaria implexa is very much like a medusa described by McCrady as Gemmaria gemmosa, found in Charleston Harbour, U.S.A. DISTRIBUTION. Scotland-Forfarshire, Allman (H'). Eirth of Porth, Wright (H) ; Allman (H). England-30 miles E. of Holy Island, Alder (H). Cullercoats, Alder (H) ; Seaham Harbour, Hodge (H) ; Plymouth, E. T. B. (M1). 1 H = Hydroid form, with or without medusa-buds. M = Free-swimming medusoid form only. |