(Sars, 1846)
Apico-lateral ridges on nectophores with distinct notch toward the ostium. Lateral and vertical lateral ridges only present in larger nectophores, and even then the former can be indistinct. Nectosac T-shaped. Lateral radial canals distinctly looped. Foliaceous bracts, usually tridentate at the distal end, but some small bracts do not show this feature. The convex dorsal side bears 3 ridges, often indistinct in smaller ones, on the distal half. Bracteal canal extends to about four-fifths the length of the bract, occasionally continuing as a very fine canal to the distal tip.