Shell rough, nearly spherical, slightly flattened at the base, with small regular circular pores. In the centre of the basal plate a bilateral symmetrical cross with four ovate collar pores; two cardinal pores twice as large as the two jugular pores and six to eight times as broad as the other shell-pores. _Dimensions._--Diameter of the shell 0.26, of the enclosed ring 0.09. _Habitat._--South Atlantic, Station 332, depth 2200 fathoms. 3. _Sphærospyris globosa_, n. sp. (Pl. 83, fig. 4). Shell smooth, perfectly spherical, with small subregular circular pores. In the centre of the basal plate no larger collar pores. (The original collar pores are here of the same size as the other pores, and cannot therefore be distinguished.) _Dimensions._--Diameter of the shell 0.13, of the enclosed ring 0.06. _Habitat._--Tropical Atlantic, Station 347, depth 2250 fathoms. Genus 485. _Nephrospyris_,[103] Haeckel, 1881, Prodromus, p. 444. _Definition._--#Androspyrida# with a discoidal, kidney-shaped, or subcircular shell, with a basal incision; without transverse constriction and free basal feet. The genus _Nephrospyris_ is one of the most peculiar and most modified of the #Spyroidea#, of extraordinary size, in this respect surpassing all other genera of this {1101}suborder, and differing from them in its flat discoidal form. The diameter of the compressed shell often reaches one half millimetre or more; its perimeter is elliptical or nearly circular, smooth, constantly with a characteristic deep sternal incision or a basal sinus on the basal pole of the main axis. The central sagittal ring is comparatively small. The margin is often inflated like a delicate reticular girdle, and contains a large number of peculiar spherical or roundish nucleated cells (Pl. 90, figs. 6-10). According to the observations of Dr. John Murray, made on living _Nephrospyris_, they are Vorticellina, perhaps constant Symbiontes. Subgenus 1. _Nephrodictyum_, Haeckel, 1881, Prodromus, p. 444. _Definition._--Network of the shell simple, with bars of nearly equal breadth. 1. _Nephrospyris renilla_, n. sp. (Pl. 90, figs. 9, 10). Shell kidney-shaped, one and a half times as broad as long, and three times as long as the deep kidney-shaped sternal incision. Ring with six pairs of branched apophyses, the bars of the apical pair vertical, of the basal pair divergent. The corresponding bars of the two middle pairs (on the frontal and the occipital face) form together on each side a large pentagonal or hexagonal naso-orbital area, which is surrounded by four or five large polygonal meshes; the other meshes become smaller towards the inflated margin. All meshes simple, without arachnoidal framework. _Dimensions._--Shell 0.3 to 0.4 long, 0.4 to 0.5 broad; ring 0.08 to 0.1 long. _Habitat._--Central Pacific, Station 272, depth 2600 fathoms. 2. _Nephrospyris nephridium_, n. sp.