Report on the zoological collections made in the Indo-Pacific Ocean ...

ECHINODERMATA, 16924. Actinometra alternans.P. H. Carpenter, Notes Leyd. Mus. iii. p. 208.An example of this interesting species was determined for me byMr. P. H. Carpenter ; the stumps of two cirri are still present.Port Molle.25. Actinometra paucicirra. (Plate XYII. fig. A, a.)Centrodorsal small, low, rounded, with 5 or 6 marginal cirri of15-18 joints, a number of which are longer than broad ; the penultimatespine exceedingly small.First radials visible, second radials very wide, not in contact,united with the third by a syzygy. Twenty arms ; two joints in thedistichals united by a syzygy, the more prominent joints in contact.First and second brachials united by a syzygy ; third and fourthpretty regularly obloHg ; the fifth faintly wedge-shaped ; after thisthe wedge-shaped form becomes more marked, but the edges do notoverlap.Syzygies on the eighth and twelfth, then from 3-5 joints betweeneach. First pinnules longer than the second, and the tliird than thefourth; the first alone of any considerable size : its joints ])roduccdinto very prominent edges. The succeeding pinnules small; laterout they enlarge somewhat, but are never at all long.Arms about 70 millim. long, cirri 8 millim., disk 7 millim. indiameter. A slight development of calcareous deposit between thebases of the arms.Colour creamy white above, rather darker below.Prince of Wales Channel ; Thursday Island.26. Actinometra multifida.Comatula multifida, /. Miill. p. 26.Percy Island, Queensland; Albany Island; Prince of WalesChannel.27. Actinometra variabilis. (Plate XVII. fig. B, a.)Centrodorsal of moderate size, concave in the middle, with 10marginal cirri, of about 15 joints ; very faint indications of spineson the most distal only.First radials visible, second exceedingly wide in proportion totheir length, in contact ; the third almost perfectly triangular, nota syzygy ; there are normally three distichals, and the axillary is asyzygy ;there are two palniars and no syzygy, or three palmars anda syzygy. If there is another division there are two joints, and theaxillary is not a syzygy. Arms from 00-90.