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Show 532 PROF. F.J. BELL ON THE COMATULIDvE. [June 6, 1 A'RP - is the formula for a multiradiate1 Actinomelra with its c radial and palmar (though not its distichal) axillaries syzygies, with a syzygy on its first brachial, with less than 13 cirri, and more than 40 cirrus-joints. When a character frequently though not always obtains, the corresponding letter is put within brackets: thus 3AR(P) * would be the formula of a species of Antedon in which, though the radial and third brachial joints were always syzygial, the palmar axillary was only sometimes so ; in those rare cases in which divisions extend beyond the palmars, I have made use of the svmbols P' and P". In the lists that follow, the greater number of described species of Antedon and Actinometra will be found enumerated and their formulae given ; in addition there are given the names and formulae of some new forms that have been lately collected by Dr. Coppinger, of H.M.S. 'Alert,' the descriptions of which will be shortly published elsewhere. As in the paper on Asterias, I have given only one reference to the description of each species. In addition to the heavy debt which I owe to the published writings of Mr. P. Herbert Carpenter, I have to add that the formulae of some of the species of Johannes Miiller are given with more satisfactory knowledge than the rest, owing to the fact that Mr. Carpenter, in a manner of which I know not whether the scientific liberality or the amiable friendliness is the more remarkable, has provided me with copies of the notes made by him on the specimens which formed the bases of Muller's descriptions. Mr. Herbert Carpenter's two papers referred to in the following lists are to be found (i.) in the ' Notes from the Leyden Museum,' vol. iii., and (ii.) in the 'Bulletin of the Museum of Compar. Zoology,' ix. no. 4. The references to Johannes Midler's ' Ueber die Gattung Comatula' refer to the pagination of the separate copies ; Count Pourtales's papers are to be found in, respectively, (i.) Bull. M . C.Z. no. 6, (ii.) B. M . C. Z. no. 11, and (iii.) B. M. C. Z. v. no. 9. The other references will explain themselves. I. LISTS OF DESCRIBED SPECIES. (a) ANTEDON. 1. udeona, Miill. p. 15. 2. alata, Pourt. iii. p. 215. 3. armata, Pourt. ii. p. 356. 4. articulata, Miill. p. 27. 5. bimaculata, Carp. i. p. 186. 6. brevicuneata, Carp. i. p. 187. 1 When D or P appear in a formula it is clear the species must have more than 10 rays, because of the meaning of the words those letters represent; where, however, neither distichals nor palmars present a syzygial joint, it will be necessary to make use of the mathematical sign for the square root to mark the fact of its being a multiradiate species. |
