Fig. 7. Lychnaspis minima, n. sp., × 400 841 Five-sided basal pyramid of a tropical spine, with the leaf-cross, seen from the centre. Fig. 8. _Lychnaspis minima_, n. sp., × 400 841 Six-sided basal pyramid of a polar spine, with the leaf-cross, seen from the centre. Fig. 9. _Icosaspis elegans_, n. sp., × 400 844 An isolated polar plate. Fig. 10. _Icosaspis cruciata_, n. sp., × 400 844 An isolated equatorial plate. Fig. 11, 12. _Dorataspis species_, × 100 Diagram of the composition of the shell of twenty plates (and also of the central union of the basal leaf-cross). Fig. 11. Oblique equatorial aspect. Fig. 12. Accurate polar aspect (compare p. 804, 805). Fig. 13. _Coscinaspis isopora_, n. sp., × 400 828 An isolated equatorial plate (with two aspinal and six coronal pores). Fig. 14. _Coscinaspis isopora_, n. sp., × 400 828 Two isolated tropical plates (_b_, northern; _d_, southern), each with two aspinal and five coronal pores. Fig. 15. _Diporaspis nephropora_, n. sp., × 400 816 Fig. 16. _Acontaspis hastata_, n. sp., × 400 829 [Illustration: 1.-5. DODECASPIS, 6.-8. LYCHNASPIS, 9. 10. ICOSASPIS, 11.-14. COSCINASPIS, 15. DIPORASPIS, 16. ACONTASPIS.] PLATE 135. LEGION ACANTHARIA. Order SPHÆROPHRACTA. Families SPHÆROCAPSIDA et DORATASPIDA. Fig. 1. _Hylaspis serrulata_, n. sp., × 300 846 Fig. 2. _Lychnaspis undulata_, n. sp., × 400 841 Fig. 3. _Lychnaspis giltschii_, n. sp., × 400 839 The spherical central capsule is enclosed in the shell. Fig. 4. _Lychnaspis rottenburgii_, n. sp., × 400 841 Fig. 5. _Zonaspis æquatorialis_, n. sp., × 300 834 Fig. 6. _Sphærocapsa cruciata_, n. sp., × 150 798 The entire shell, with its twenty cruciate perspinal holes. Fig. 7. _Sphærocapsa cruciata_, n. sp., × 800 798 Insertion of one spine in the cruciate perspinal hole of the shell. Fig. 8. _Sphærocapsa quadrata_, n. sp., × 800 798 A group of pores and dimples in the shell surface. Fig. 9. _Sphærocapsa dentata_, n. sp., × 800 798 Insertion of one spine in the cruciate perspinal hole of the shell. Fig. 10. _Sphærocapsa pavimentata_, n. sp., × 800 798 Insertion of one spine in the perspinal hole of the shell, which is composed of four cruciate aspinal holes and surrounded by a group of dimples and pores. [Illustration: 1.-5. LYCHNASPIS, 6.-10. SPHAEROCAPSA.] PLATE 136. LEGION ACANTHARIA. Orders SPHÆROPHRACTA ET PRUNOPHRACTA.