746 MR. p. H. CARPENTER ON THE [DcC. 19, 



I subjoin the formulae for all the variations of structure that I 

 have met with among the GomatulcB, together with the names of 

 nearly all the described species to which the respective formulae 

 apply. Grube's two species, C. Icevissima and O, 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 tneridionalis. The former is identical with the Antedon pul- 

 chella of Pourtales 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 formulae which 

 he gives for them. 



Lists of Formula. 



Antedon. 

 I. A. R.3. 

 A.R.3.2.2. 

 A. R.3.3. 



II. A. lO.'' adeonce, antarctica, armata, brevipinna, ca- 



rinata, celtica, cubensis, dentata^, dubeni, 

 eschrichti, hageni, insignis, jacquinoti, 

 loveni, milberti, milleri, IcBvipinna, per- 

 spinosa, petasus, phalangium, pmniformis, 

 prolixa, rosacea, rubiginosa, serripinna. 



III. A.2.|- 



A. 2, brevipinna, macronemu, 



A. 2.2. (Bquipinna, articulata, bimaculata, brevi- 



cuneata, elongata, flagellata, imparipinna, 

 indica, Icevieirra, pahnata, protecta, spi- 

 cat a, spini/era. 



A. 2.2.2. palmata. 



IV. A.sJ. 



A . 3, briareus, decipiens, elegans, reynaudi *, 



rubiginosa. 

 A. 3.1. 



A. 3.2. acuticirra, crenulata, granulifera, irregularis, 



ludovici, savignii, variipinna. 

 A. 3.2.3. 



1 See Bull. Mus. Comp. Zool. vol. ix. no. 4, 1881, pp. 6, 9. 



^ In cases like this, when there are a large number of species iu any giyen 

 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. 



s 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 Miiller's de- 

 scription, which is incorrect. It should be 3 AD -. 



