24. Lithostrobus lithobotrys, n. sp. (Pl. [79], fig. 17).
Shell slender, conical, smooth, with straight axis, and four deep strictures. Joints of different lengths, gradually increasing towards the mouth, the length of the fifth joint equals half its breadth, and one-third of the length of the whole shell. The single joints bear each four or five transverse rows of small, roundish pores. Cephalis irregularly lobate, with four to six prominent lobes, and the same number of small, conical horns.
Dimensions.—Length of the shell (with five joints) 0.12; length of the fifth joint 0.04, breadth 0.08.
Habitat.—Central Pacific, Station 268, depth 2900 fathoms.
Genus 643. Dictyomitra,[[260]] Zittel, 1876, Zeitschr. d. deutsch. geol. Gesellsch., p. 80.
Definition.—Stichocorida (vel Stichocyrtida eradiata aperta), with conical shell gradually dilated towards the wide open mouth. Cephalis without horn.
The genus Dictyomitra agrees with the preceding Lithostrobus in the slender, conical form of the multiarticulate shell, but differs from it in the absence of a horn on the cephalis; the horn is here completely lost.
Subgenus 1. Dictyomitrella, Haeckel.
Definition.—Shell smooth, with joints nearly equal in length.
1. Dictyomitra articulata, Haeckel.