4. _Clathrocircus stapedius_, n. sp. (Pl. 92, fig. 8). Sagittal ring ovate, smooth, with six pairs of pores (two apical and four basal). The four apical pores are of nearly equal size and form a quadrangular mitral plate with two large lateral horns. The eight basal pores are of very different size (the four central far larger than the two anterior and the two posterior), and form a hexagonal basal plate, also with two large lateral horns. The four branched lateral horns (two upper and two lower) form together an incomplete frontal ring. _Dimensions._--Height of the sagittal ring 0.1, breadth 0.08. _Habitat._--Central Pacific, Station 271, depth 2425 fathoms. {963}5. _Clathrocircus dictyospyris_, n. sp. (Pl. 92, fig. 9). Sagittal ring ovate, thorny, with eight pairs of pores. The four apical and the four basal pores are elliptical and far larger than the four dorsal and the four ventral pores. Resembles a _Dictyospyris_ with open lateral gates. _Dimensions._--Height of the sagittal ring 0.08, breadth 0.06. _Habitat._--Central Pacific, Station 272, depth 2600 fathoms. 6. _Clathrocircus multiforis_, n. sp. (Pl. 92, fig. 10). Sagittal ring circular, smooth, with ten to twelve pairs of roundish pores, forming together a complete lattice-girdle with two parallel circular rows of pores. Four larger of these are the four gates of the basal ring (two jugular and two cardinal pores). _Dimensions._--Diameter of the ring 0.1 to 0.15, breadth 0.03 to 0.05. _Habitat._--Central Pacific, Stations 263 to 274, depth 2350 to 2925 fathoms. Subfamily 2. CORTINISCIDA, Haeckel. _Definition._--#Semantida# with large, typical, regularly disposed basal feet (originally three cortinar feet, one odd caudal and two paired pectoral). Genus 411. _Cortiniscus_,[30] n. gen. _Definition._--#Semantida# with three typical basal feet (an odd caudal foot and two paired lateral or pectoral feet). The genus _Cortiniscus_ is of peculiar importance, as the common ancestral form of the _Cortiniscida_, or those Semantida in which the basal ring is provided with typical, regularly disposed basal feet--three, four, or six. Since these typical basal feet (or "cortinar feet") are preserved in the greater number of all NASSELLARIA, determining their triradial structure, they possess a great morphological value. _Cortiniscus_ exhibits the same three primary feet as _Cortina_, from which it differs in the production of two or more basal pores (between the odd caudal and the paired lateral feet). 1. _Cortiniscus tripodiscus_, n. sp. (Pl. 92, fig. 11).