Habitat.—Fossil in Barbados.
Subgenus 6. Polyalacorys, Haeckel.
Definition.—Peristome with numerous (ten to twenty or more) prominent feet, three or four of which are primary and perradial, the others secondary and interradial.
13. Alacorys dodecantha, n. sp.
? Podocyrtis schomburgkii, var., Bury, 1862, Polycystins of Barbados, Taf. xii. fig. 3.
Shell smooth, with slight collar stricture. Length of the three joints = 1 : 3 : 4, breadth = 1 : 4 : 7. Cephalis ovate, with a conical horn of the same length. Thorax campanulate, with regular, circular pores. From its margin arise twelve stout, little curved, radial beams, which are widely divergent, and connected in the middle part by a transverse circular ring, so that the abdomen exhibits twelve large triangular holes, and at the peristome, alternating with these, twelve free conical feet of the same length.
Dimensions.—Length of the three joints, a 0.04, b 0.09, c 0.11; breadth, a 0.03, b 0.12, c 0.22.
Habitat.—Central Pacific, Station 263, depth 2650 fathoms; also fossil in Barbados.
14. Alacorys carcinus, n. sp. (Pl. [74], fig. 9).
Calocyclas carcinus, Haeckel, 1879, Atlas, loc. cit.