THE ANATOMY OP THE MADREPORARIA. 259 



9. v. Koch. — "Entwick. d. Kalkskeletes v. Astroides calycularis." 



'Mitt. d. Zool. Sta, Neap./ Ed. iii. 

 10. Moselet. — " Seriatopora, Pocillopora, &c," 'Quart, Journ. Micr. 



Sc.,' October, 1882. 

 II. Moseley.— ' Kept. Voyage H.M.S. "Challenger,"' Zoology, vol. ii. 

 12. Semper. — " Generationswechsel bei Steinkorallen," 'Zeitschr. f. 



wiss. Zool./ Bd. xxii. 



v. Koch. — "Die Morphologische Bedeutung d. Korallenskelets," 



< Biol. Centralblatt./ Bd. ii. 

 v. Koch. — "Mitt. ii. d. Kalkskelet d. Madreporaria," 'Morph, 



Jahrb./ Bd. viii. 



DESCRIPTION OF PLATES. 



b.iv. Cut edge of internal body-wall. ch. Calycoblast layer. Coel. 

 Coelenteron. C. or Col. Columella. Cos. Costa. B. " Directive " 

 septum and mesenteries. Ect. Ectoderm. En. Endoderm. En.S. 

 Entoseptum. Ex.S. Exoseptum. M. or Mes. Mesentery. M' "Peri- 

 pheral" part of mesentery. M. B. Mouth-disc. Me. Mesoderm. Me. 

 Mesenterial muscles. M.F. Mesenterial filament, m.long. Longitu- 

 dinal muscles, m.obl. Oblique muscles, n. Nematocyst. Pe. Pedicle. 

 S. Septum. St. Stomatodeeum. Te. Tentacle. Th. Theca, 



PV, 1. — Section through two quarters of Flabellum, diagrammatic, 

 the right half showing the primary and secondary mesen- 

 teries attached to the stomatodseum, taken along the line 

 b, Fig. 2, the left being lower down in the polyp, where the 

 mesenteries have all developed filaments, taken along the 

 line c, Fig 2. A. Exocoele. B. Entoccele. i, ii, iii, 

 Orders of septa and mesenteries, wrongly numbered in the 

 figure. The numbers should run, reckoning from the 

 central directive septum (B), 1, 4, 3, 4, 2, 4, 3, 4, 1, &c. 

 Corallum coloured deep black throughout the figures. 



Fig. 2. —Diagrammatic section along the line a, Fig. 1, i.e. in an 

 exocoele, so that the external face of the mesentery is seen 

 flat, while the mouth-disc and internal body-wall are cut. 

 The contortions of the free edge of the mesentery are 

 omitted. 



