136 ON A NEW MADREPORARIAN CORAL. [Feb. 16, 
the Sclerodermic Zoantharia, Ed. and H., or Madreporaria.— 
Journ. Linn. Soe., Zool. vol. xviii. p. 1. 
4. Fowier, G. H. The Anatomy of the Madreporaria, I.—Quart. 
Journ. Microse. Science, vol. xxv. p. 577. 
5. Kocu, G.v. Bemerkungen iiber das Skelet der Korallen.—Mor- 
phol. Jahrbuch, vol. v. p. 316. 
6. Mosrtry, H.N. On the Colouring Matters of various Animals. 
—Quart. Journ. Microse. Science, vol. xvii. p. 1, 1877. 
7. Hertwic, O. und R. Die Actinien. Jena, 1879. 
8. Heiner, A. v. Die Gattung Cladocora, Ehrenb.—S. B. Acad. 
Wien, vol. Ixxxiv. p. 634. 
9. Kocu, G.v. Ueber die Entwicklung des Kalkskeletes von Aste- 
roides calycularis und dessen morphologischen Bedeutung.— 
Mitt. Zool. St. Neapel, vol. ii. p. 284. 
EXPLANATION OF THE PLATES. 
Puate 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, @, 4, c, and d; on the right side above are 
seen the mesenteries, shaded, in pairs of two sizes /' and /", 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 pali, C the 
columella. 
Priate XIII, 
Fig. 2. Oral view of Stephanotrochus moseleyanus, with the soft parts removed 
from all except the left upper corner of the coral (nat. size). 
. Aboral view, the tissues being left in the right upper corner. 
. Side view of the coral. 
. View of a secondary and quinary septum, seen from the side: p’, palus 
of secondary ; p'’, palus of quinary septum; 4, costz, with blunt points. 
. Section of the end of the knob of a tentacle: He, ectoderm; J/, meso- 
derm; En, entoderm; Th.c, thread-cells; Lm, longitudinal muscle- 
fibres; Om, circular muscle-fibres. 
. Part of a longitudinal section of a mesentery, showing—En", entoccelic 
endoderm; Hn', ectoccelic endoderm; mm’, longitudinal muscle-fibres 
of the entoccelie face; m', oblique muscles of the ectoccelic face ; 
MM, mesoderm lamella. 
D> OPC 
bas | 
Puate XIV. 
Fig. 8. Ectoccelic face of a larger mesentery, showing arrangement of muscle- 
fibre lines: m/f. mesenterial filaments; 0, ova. 
9, Entoccelie face of the same mesentery, showing the longitudinal muscle- 
fibre lines. 
10, Longitudinal section of the ventral end of a mesentery: cal, calyco- 
blasts which lay down the columella; M, mesoderm; ov, ova in all 
stages of development; Ln, endoderm; .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 Jamella of the 
mesentery splits to line the columella on each side, and then twmns 
back to line the septum. 
12. Shows two isolated calycoblastie cells. 
13. Drawn from a flat preparation of ealycoblastie cells. 
a 
