_Habitat._--South Pacific, Station 300, depth 1375 fathoms Genus 517. _Haliphormis_,[134] Ehrenberg, 1847, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 54 (_sensu mutato_). _Definition._--#Archiphormida# (vel Monocyrtida multiradiata aperta) with numerous radial ribs in the wall of the campanulate shell, prolonged into free terminal feet. Apex with a horn. The genus _Haliphormis_ (with an apical horn) and the following _Archiphormis_ (without a horn) comprise those Archiphormida in which the open mouth is more or less constricted and surrounded by a coronet of radial feet, as terminal prolongations of the radial ribs of its wall. The few forms, upon which Ehrenberg originally founded the genus _Haliphormis_, are partly not recognisable, partly belong to other genera. We therefore give here a new definition of the genus, as stated in my Prodromus, 1881, p. 428. {1167}1. _Haliphormis lagena_, n. sp. (Pl. 97, fig. 5) Shell bottle-shaped, twice as long as broad, tapering towards both ends, with nine longitudinal curved ribs. These are connected by irregular transverse beams, and the quadrangular meshes, so produced, are filled up by irregular, delicate, arachnoidal framework. The constricted mouth is half as broad as the middle part of the shell and surrounded by nine slender convergent feet, the free distal ends of the ribs. The apex bears a small knob with an oblique horn, perhaps the rudimentary cephalis of _Sethamphora_ or _Sethopyramis_ (?). _Dimensions._--Shell 0.6 to 0.7 long, 0.3 to 0.4 broad. _Habitat._--South Atlantic, Station 332, depth 2200 fathoms. 2. _Haliphormis costata_, n. sp. Shell campanulate, somewhat longer than broad, with twelve prominent longitudinal ribs, alternating with twelve rows of regular circular pores. Mouth constricted half as broad as the shell, with twelve long triangular feet, formed by the free distal ends of the ribs. Apical horn short and stout, triangular pyramidal. _Dimensions._--Shell 0.12 long, 0.1 broad; mouth 0.07 long. _Habitat._--Central Pacific, Station 271, depth 2425 fathoms. Genus 518. _Archiphormis_,[135] Haeckel, 1881, Prodromus, p. 428. _Definition._--#Archiphormida# (vel Monocyrtida multiradiata aperta) with numerous radial ribs in the wall of the campanulate or urceolate shell, prolonged into free terminal feet. Apex without horn. The genus _Archiphormis_ differs from the preceding _Haliphormis_, its probable ancestral form, in the absence of the apical horn. The number of the longitudinal ribs, which are prolonged into terminal feet, is from six to nine or twelve or even more. 1. _Archiphormis cancellata_, Haeckel. (?) _Halicalyptra cancellata_, Ehrenberg, 1854, Monatsber. d. k. preuss. Akad. d. Wiss. Berlin, p. 243.