746 MR, P. H. CARPENTER ON THE [Dec. 19, 
I subjoin the formule for all the variations of structure that I 
have met with among the Comatule, together with the names of 
nearly all the described species to which the respective formule 
apply. Grube’s two species, C. levissima and C. mertensi, are 
referred by Prof. Bell to Antedon, and probably correctly so; but 
two other species in his Anéedon-list have no existence, viz. alata 
and meridionalis. The former is identical with the Antedon pul- 
chella of Pourtalés and was referred to Actinometra in 1881, while the 
latter also belongs to this genus’. Some of Prof. Bell’s MS. species 
are also omitted, owing to the incompleteness of the formulee which 
he gives for them. 
Lists or ForMULZ. 
Antedon. 
I. A. R.3. 
A. B.3.2.2. 
A. R.3.3. 
II. A. 10.? adeone, antarctica, armata, brevipinna, ca- 
rinata, celtica, cubensis, dentata*®, dubeni, 
eschrichti, hageni, insignis, jacquinoti, 
lovéni, milberti, milleri, levipinna, per- 
spinosa, petasus, phalangium, pinniformis, 
prolixa, rosacea, rubiginosa, serripinna. 
HI. A. 2. 2 
A. 2. brevipinna, macronema. 
A. 2.2. equipinna, articulata, bimaculata, brevi- 
cuneata, elongata, flagellata, imparipinna, 
indica, levicirra, palmata, protecta, spi- 
cata, spinifera. 
A. 2.2.2. palmata. 
IV. A.32 
A. 3. briareus, decipiens, elegans, reynaudi’, 
rubiginosa. 
Baal. 
deers 
A. 3.2. acuticirra, crenulata, granulifera, irregularis, 
ludovici, savignii, variypinna. 
A. 3.2.3. 
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 Amt. sarst? of Diiben 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. 
4 The formula given by Prof. Bell for this species is based on Miiller’s de- 
scription, which is incorrect. It should be 3 AD 2 
