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Show 136 ON A NEW MADREPORARIAN CORAL. [Feb. 16, the Sclerodermic Zoantharia, Ed. and H., or Madreporaria - Journ. Linn. Soc, Zool. vol. xviii. p. 1. 4. F O W L E R , G. H. The Anatomy of the Madreporaria, I.-Quart. Journ. Microsc. Science, vol. xxv. p. 577. 5. K O C H , G. V. Bemerkungen fiber das Skelet der Korallen.-Mor-phol. Jahrbuch, vol. v. p. 316. 6. M O S E L E Y , II. N. On the Colouring Matters of various Animals. -Quart. Journ. Microsc. Science, vol. xvii. p. 1, 1877. 7. H E R T W I G , O. und R. Die Actinien. Jena, 1879. 8. HEIDER, A. V. Die Gattung Cladocora, Ehrenb.-S. B. Acad. Wien, vol. lxxxiv. p. 634. 9. K O C H , G. V. TJeber die Entwicklung des Kalkskeletes von Aste-roides calycularis und dessen morphologischen Bedeutung.- Mitt. Zooi. St. Neapel, vol. iii. p. 284. EXPLANATION OF THE PLATES. PLATE XII. Fig. 1. Diagram of Stephanotrochus to show the arrangement of tentacles, mesenteries, and septa ; on the left-hand side are shown the tentacles, arranged in four cycles, a, b, c, and d; on the right side above are seen the mesenteries, shaded, in pairs of two sizes V and I", with longitudinal muscles facing one another; at D is seen the directive mesentery, with its longitudinal muscle facing outwards; the septa in five cycles are numbered from 1 to 5; p' and p" denote the pah, C the columella. PLATE XIII. Fig, 2. Oral view of Stephanotrochus moseleyanus, with the soft parts removed from all except the left upper corner of the coral (oat. size). 3. Aboral view, the tissues being left in the right upper corner. 4. Side view of the coral. 5. View of a secondary and quinary septum, seen from the side: p\ palus of secondary ; p"', palus of quinary septum ; k, costa?, with blunt points. 6. Section of the end of the knob of a tentacle: Ec, ectoderm; M, mesoderm ; En, entoderm; Th.c, thread-cells; Lm, longitudinal muscle-fibres ; Cm, circular muscle-fibres. 7. Part of a longitudinal section of a mesentery, showing-En", entocoelic endoderm; En', ectoccelic endoderm; m", longitudinal muscle-fibres of the entocoelic face; m', oblique muscles of the ectoccelic face; M, mesoderm lamella. PLATE XIV. Fig. 8. Ectoccelic face of a larger mesentery, showing arrangement of muscle-fibre lines : mf, mesenterial filaments ; o, ova. 9. Entocoelic face of the same mesentery, showing the longitudinal muscle-fibre lines. 10. Longitudinal section of the ventral end of a mesentery: cal, calycoblasts which lay down the columella; M, mesoderm; ov, ova in all stages of development; En, endoderm ; m.f, mesenterial filaments with pigment-cells, p. 11. Central end of a mesentery, with calycoblasts scattered all along the corallum-facing side of the mesoderm; the mesodermal lamella of the mesentery splits to line the columella on each side, and then turns back to line the septum. 12. Shows two isolated calycoblastic cells. 13. Drawn from a flat preparation of calycoblastic cells. |
