The radial spines are completely enclosed in the rhombic calymma, the surface of which is covered with small plates, similar to those in the shell of the Sphærocapsida. Fig. 7. _Zygostaurus amphithectus_, n. sp., × 300 774 The square central capsule envelops the half skeleton. Fig. 8. _Zygostaurus sagittalis_, n. sp., × 300 775 Fig. 9. _Lithoptera tetraptera_, n. sp., × 300 779 Fig. 10. _Lithoptera quadrata_, n. sp., × 300 780 The central part of the skeleton is enclosed by the four-lobed central capsule. [Illustration: 1.-3. QUADRILONCHE, 4.-6. BELONOSTAURUS, 7. 8. LONCHOSTAURUS, 9. 10. LITHOPTERA.] PLATE 132. LEGION ACANTHARIA. Orders ACTINELLIDA ET ACANTHONIDA. Families ASTROLOPHIDA, ASTROLONCHIDA et AMPHILONCHIDA. Fig. 1. _Amphilonche lanceolata_, n. sp., × 300 783 Fig. 2. _Amphilonche hydrotomica_, n. sp., × 300 786 The spindle-shaped central capsule is filled up with small granules. The clear calymma forms conical sheaths for the spines, with myophriscs. Fig. 3. _Amphilonche diodon_, n. sp., × 300 783 Fig. 4. _Amphilonche concreta_, n. sp., × 100 787 A complete specimen with the cylindrical central capsule. Fig. 4_a_. Central part of the skeleton, × 400 Fig. 5. _Amphilonche violina_, n. sp., × 300 787 Fig. 6. _Amphilonche conica_, n. sp., × 300 785 The ellipsoidal central capsule contains numerous nuclei and is enclosed by the calymma. The conical sheaths of the latter include the radial spines completely and exhibit coronets of myophriscs. Fig. 7. _Acantholonche amphipolaris_, n. sp., × 200 790 Fig. 8. _Acantholonche peripolaris_, n. sp., × 300 791 Fig. 9. _Amphibelone pyramidata_, n. sp., × 300 789 Fig. 10. _Amphibelone cultellata_, n. sp., × 400 789 The central capsule contains numerous spherical nuclei and is enclosed by the hyaline calymma, which forms conical sheaths around the spines. Fig. 11. _Stauracantha johannis_, n. sp., × 400 763 Basal part of a radial spine, exhibiting the peculiar torsion of the basal leaf-cross and the central apex. Fig. 12. _Astrolophus solaris_, n. sp., × 200 732 Fig. 12_a_. A group of larger and smaller radial spines united in the centre. Fig. 12_b_. Three isolated spines (one larger and two smaller), × 200 [Illustration: 1.-6. AMPHILONCHE, 7. 8. ACANTHOLONCHE, 9.-12. AMPHIBELONE.] PLATE 133. LEGION ACANTHARIA. Order SPHÆROPHRACTA. Families SPHÆROCAPSIDA, DORATASPIDA et PHRACTOPELTIDA.