Genus 493. Pylobotrys,[[110]] Haeckel, 1881, Prodromus, p. 440.
Definition.—Pylobotryida with tubes on the cephalis, and with the mouth of the abdomen open.
The genus Pylobotrys differs from the closely allied Acrobotrys, its ancestral form, in the development of an abdomen or a third shell-joint, the basal mouth of which remains open.
1. Pylobotrys putealis, n. sp. (Pl. [96], fig. 21).
Cephalis multilobate, with a single curved and descending tube on the base of its anterior part (sternal tube). Occipital half of the cephalis divided into three large odd lobes (the largest the apical); facial half divided into three to five lobes, an odd frontal and one or two lateral pairs of small buccal lobes. Thorax truncate conical, about as large as the cephalis and larger than the truncate abdomen. Pores regular circular.
Dimensions.—Length of the shell 0.12, breadth 0.08.
Habitat.—Tropical Atlantic Station 347, depth 2250 fathoms.
2. Pylobotrys fontinalis, n. sp. (Pl. [96], fig. 20).
Cephalis trilobate, with three ovate lobes in the sagittal plane, of nearly equal size, and two divergent cylindrical tubes conical at the base. An ascending apical tube on the apex of the occipital lobe and a descending sternal tube on the base of the frontal lobe. The middle lobe between the former distinctly exhibits in the apical view (fig. 20) the collar septum with the four cortinar pores. Thorax campanulate, larger than the cephalis and the truncate abdomen.
Dimensions.—Length of the shell 0.11, breadth 0.06.