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Show 746 MR. P. H. CARPENTER ON THE [Dec. 19, I subjoin the formulae for all the variations of structure that I have met with among the Comatula, together with the names of nearly all the described species to which the respective formulae apply. Grube's two species, C. lavissima and C. mertensi, are referred by Prof. Bell to Antedon, and probably correctly so ; but two other species in his Antedon-list have no existence, viz. alata and meridionalis. The former is identical with the Antedon pulchella of Pourtales and was referred to Actinometra in 1881, while the latter also belongs to this genus 1. Some of Prof. Bell's M S . species are also omitted, owing to the incompleteness of the formulae which he gives for them. LISTS OF FORMULAE. Antedon. I. A. R.3. A. ix.3.2.2. A. R.3.3. II. A. IO.2 adeona, antarctica, armata, brevipinna, carinata, celtica, cubensis, dentata3, dubeni, eschrichti, hageni, insignis, jacquinoti, loveni, milberti, milleri, lavipinna, per-spinosa, petasus, phalangium, pinniformis, prolixa, rosacea, rubiginosa, serripinna. III. A.2.JJ-A. 2. brevipinna, macronema. A. 2.2. aquipinna, articulata, bimaculata, brevi-cuneata, elongata, flagellata, imparipinna, indica, lavicirra, palmata, protecta, spi-cata, spinifera. A. 2.2.2. palmata. IV. A. 31. A. 3. briareus, decipiens, elegans, reynaudi4, rubiginosa. A. 3.1. A. o. ~~n-. A. 3.2. acuticirra, crenulata, granulifera, irregularis, ludovici, savignii, variipinna. A. O.2.3. 1 See Bull. Mus. Comp. Zool. vol. ix. no. 4, 1881, pp. 6, 9. 2 In cases like this, when there are a large number of species in any given group, some further mode of classification becomes necessary ; and the notation proposed by Prof. Bell for the varying characters of the cirri is very useful for this purpose. 3 This species is undoubtedly identical with the Ant. sarsii of Duben and Koren; and as Say's name is the older by nearly twenty years, I feel that it is only right to follow Prof. Verrill in restoring it. * The formula given by Prof. Bell for this species is based on Muller's description, which is incorrect. It should be 3 A D -. |