The soft body alone, without the skeleton. The bilobed central capsule exhibits a central transverse nucleus, and on each lobe a stratum of oil-globules. The kidney-shaped calymma contains on the margin numerous symbiontes (_Xanthellæ_ or _Vorticellinæ_? Compare page 1102). Fig. 8. _Nephrospyris paradictyum_, n. sp., × 500 1102 Three single unicellular symbiontes (_Zooxanthellæ_?). Fig. 9. _Nephrospyris renilla_, n. sp. (vel _Nephrodictyum renilla_), × 250 1101 The bilobed central capsule is enclosed by the discoidal shell and in the middle constricted by the sagittal ring; it contains a transverse nucleus. The kidney-shaped calymma contains in the peripheral part numerous symbiontes (_Xanthellæ_ or _Vorticellinæ_? Compare page 1101). Fig. 10. _Nephrospyris renilla_, n. sp., × 250 1101 A singular abnormality (occurring not rarely), in which the reduced skeleton has nearly disappeared and the sagittal ring alone remained. The kidney-shaped calymma, however, which encloses numerous symbiontes, has preserved the form of the skeleton. The bilobed central capsule is similar to that in figs. 7 and 9, and is encircled by the thickened sagittal ring. [Illustration: PARADICTYUM.] PLATE 91. LEGION NASSELLARIA. Orders NASSOIDEA ET PLECTOIDEA. Families NASSELLIDA, PLAGONIDA et PLECTANIDA. Fig. 1. _Cystidium princeps_, n. sp., × 400 897 Fig. 2. _Triplagia primordialis_, n. sp., × 100 909 Fig. 3. _Tetraplagia phænaxonia_, n. sp., × 200 911 Fig. 4. _Plagoniscus tripodiscus_, n. sp., × 200 912 Fig. 5. _Plagiocarpa procortina_, n. sp., × 300 914 Fig. 6. _Plagonium sphærozoum_, n. sp., × 300 916 Fig. 7. _Triplecta triactis_, n. sp., × 300 922 Fig. 8. _Tetraplecta pinigera_, n. sp., × 300 924 Fig. 9. _Plectaniscus cortiniscus_, n. sp., × 300 925 Fig. 10. _Periplecta cortina_, n. sp., × 400 926 Fig. 11. _Plectanium trigeminum_, n. sp., × 400 928 Fig. 12. _Polyplecta heptacantha_, n. sp., × 300 929 [Illustration: 1. CYSTIDIUM, 2.-6. PLACONIDA, 7.-12. PLECTANIDA.] PLATE 92. LEGION NASSELLARIA. Order STEPHOIDEA. Families STEPHANIDA et SEMANTIDA. Fig. 1. _Semantis sigillum_, n. sp., × 400 957 Fig. 2. _Semantis biforis_, n. sp., × 300 956 Fig. 3. _Semantrum tetrastoma_, n. sp., × 300 959 Fig. 4. _Semantrum signarium_, n. sp., × 400 960 Fig. 5. _Semantrum quadrifore_, n. sp., × 400 958