Cephalis quinquelobate, about as large as the ovate thorax, and twice as large as the hemispherical abdomen (which is identical with the "crista obtusa finis anterioris" of Ehrenberg). Occipital lobe helmet-shaped, about twice as long as the two pairs of lateral lobes (the superior frontal and the inferior buccal lobes). _Dimensions._--Length of the shell 0.08, breadth 0.04. _Habitat._--Fossil in Barbados. 4. _Botryocampe rotalia_, n. sp. (Pl. 96, fig. 23). Cephalis quinquelobate, half as large as the campanulate thorax and the subspherical abdomen. Occipital lobe ovate, one and a half times as long as the two ovate frontal lobes, and three times as long as the two subspherical buccal lobes. Collar septum with six distinct cortinar pores (two anterior jugular, two middle cardinal and two posterior cervical, fig. 23). _Dimensions._--Length of the shell 0.1, breadth 0.06. _Habitat._--South Pacific, Station 295, depth 1500 fathoms. {1124}5. _Botryocampe camerata_, n. sp. (Pl. 96, fig. 24). Cephalis multilobate, about as long and half as broad as the irregularly campanulate thorax, which is half as long as the subspherical large abdomen. Occipital lobe of the cephalis helmet-shaped, larger than its uviform frontal part, which is divided into six to eight small subspherical lobes. In the interior of the thorax and abdomen irregularly branched rods are visible, which divide their inner space into compartments or incomplete chambers. Pores large, regular, circular, hexagonally framed. _Dimensions._--Length of the shell 0.15, breadth 0.09. _Habitat._--Central Pacific, Station 271, depth 2425 fathoms. Genus 495. _Phormobotrys_,[112] Haeckel, 1881, Prodromus, p. 440. _Definition._--#Pylobotryida# with tubes on the cephalis, and with the mouth of the abdomen closed. The genus _Phormobotrys_ differs from the similar and closely allied _Pylobotrys_ in the development of a basal lattice-plate closing the terminal mouth of the thorax, and corresponds therefore to _Lithobotrys_ among the Lithobotryida. As in the latter and in _Cannobotrys_, &c., so here in _Phormobotrys_, different subgenera may be distinguished, according to the different number and disposition of the radial tubes which become developed from the lobate cephalis. 1. _Phormobotrys trithalamia_, n. sp. (Pl. 96, fig. 26). Cephalis trilobate, with a single apical tube, which is only one-third as long, spindle-shaped, pointed, with frontal opening. Frontal lobes ovate, two-thirds as long as the helmet-shaped occipital lobe. Internal frontal septum of the cephalis with four large pores. Thorax cylindrical, twice as long as the hemispherical abdomen. Pores small and numerous, irregular, roundish. _Dimensions._--Length of the shell 0.16, breadth 0.05. _Habitat._--Central Pacific, Station 266, depth 2750 fathoms. 2. _Phormobotrys pentathalamia_, n. sp. (Pl. 96, fig. 27).