Eupatinapta

Heding, 1928

2 species

Tentacles pinnate, usually 12. Sense organs never in the form of pigment eyes, but occur as sensory cups on the oral side of the tentacles. Calcareous ring well developed and the radial pieces perforated for the nerves. Cartilaginous ring wanting. Polian vesicles few. Stone canal single and unbranched. Stock of anchors are not branched but finely toothed. Anchor arms more of less serrate and the vertex smooth, the anchors from posterior end of the body are of different size and shape, the larger ones being distinctly different from those in the anterior end of the body. The anchor plates are of varying size and shape. The small plates have, in both ends of the body, seven large holes in the anterior end, and no bridge an distinct articulation for the anchors. The large plates are elongate and like those of Synapta. In the anterior end of the plates there are always more than seven large toothed holes (usually 13-16) and the articulations with the anchors is well developed and rather like that of the plates ofProtankyra, a well developed bridge being wanting. Ciliated funnels may be rather large and of varying sizes. (Heding, 1928)