Dimensions.—Diameter of the whole body 18, of the fork-thicket 2.4 to 3.0.
Habitat.—North Atlantic, Canary Islands, Station 354, surface.
2. Cœlothamnus davidoffii, Bütschli.
Cœlothamnus davidoffii, Bütschli, 1882, Zeitschr. f. wiss. Zool., vol. xxxvi. p. 486, Taf. xxxi.
Sixteen styles all of equal length (?), about four times as long (in their free part) as the diameter of the fork-thicket. The size of the anchor-pencils is nearly equal throughout their entire length. (Compare the careful description of this species by Bütschli.)
Dimensions.—Diameter of the whole body 15, of the fork-thicket 1.8.
Habitat.—Mediterranean (Villafranca, near Nice), Davidoff, surface.
3. Cœlothamnus sedecimalis, n. sp.
Sixteen styles straight, of different sizes. The pectoral or anterior branch of each frontal main tube is simple, and twice as long as the diameter of the large fork-thicket. The tergal or posterior branch is forked at the base, and its anterior branch is again forked in the middle part, so that three long divergent styles arise from each tergal tube. The hindermost of these is the longest, three times as long as the diameter of the fork-thicket. All anchor-pencils have nearly equal size.
Dimensions.—Diameter of the whole body 22, of the fork-thicket 5.2.