Distal end of a tube. Fig. 12. _Aulographis verticillata_, n. sp., × 400 1582 Distal end of a tube. Fig. 12_a_. Apical view, with four verticils of five branches. Fig. 13. _Aulographis tripentas_, n. sp., × 300 1582 Distal end of a tube. Fig. 13_a_. Apical view, with three verticils of five branches. Fig. 14. _Auloceros dicranaster_, n. sp., × 400 1585 Distal end of a tube, seen from the side. Fig. 15. _Auloceros dicranaster_, n. sp., × 200 1585 Distal end of a tube, seen from the terminal face. Fig. 16. _Aulacantha cannulata_, n. sp., × 300 1576 Distal end of a tube. [Illustration: 1.-5. AULODENDRON. 6.-15. AULOGRAPHIS. 16. AULACANTHA.] PLATE 106. LEGION PHÆODARIA. Orders PHÆOSPHÆRIA. Family OROSPHÆRIDA. OROSPHÆRIDA. Fig. 1. _Orosphæra serpentina_, n. sp., × 50 1595 The entire shell. Fig. 2. _Orosphæra horrida_, n. sp., × 50 1596 The entire shell. Fig. 3. _Orosphæra arborescens_, n. sp. (vel _Orothamnus arborescens_), × 50 1597 The entire shell. Fig. 4. _Oroscena gegenbauri_, n. sp., × 50 1597 The entire shell. (Compare Pl. 12, fig. 1.) [Illustration: 1. 2. ORONIA, 3. OROTHAMNUS, 4. OROSCENA.] PLATE 107. LEGION PHÆODARIA. Order PHÆOSPHÆRIA. Family OROSPHÆRIDA. (Fig. 8 of this Plate has no number, by mistake; it is at the top in the middle.) Fig. 1. _Oroplegma diplosphæra_, n. sp., × 50 1600 The entire shell, enveloped by an outer mantle of spongy framework. Fig. 2. _Oroplegma giganteum_, n. sp., × 200 1601 A small piece of the spongy framework. Fig. 3. _Oroplegma spongiosum_, n. sp., × 50 1601 A pyramidal elevation of the inner shell, with its spongy framework, and a radial spine on the top. Fig. 4. _Oroscena bærii_, n. sp., × 100 1598 A pyramidal elevation of the shell, with a radial spine on its top. Fig. 5. _Orona maxima_, n. sp., × 300 1594 A small piece of the network; the central canals of the bars are partly filled by air. Fig. 6. _Oroscena cuvieri_, n. sp., × 50 1598 A single radial spine. Fig. 7. _Orona crassissima_, n. sp., × 300 1594 A single bar of the coarse network, with dimpled surface. Fig. 8. _Oroscena mülleri_, n. sp., × 50 1598 A single radial spine. [Illustration: 1.-3. OROPLEGMA. 4.-7. OROSCENA.] PLATE 108. LEGION PHÆODARIA. Order PHÆOSPHÆRIA. Family SAGOSPHÆRIDA. SAGOSPHÆRIDA. Fig. 1. _Sagoscena castra_, n. sp., × 50 1608