32 G. HERBERT FOWLER. 



9. Von Koch, G. — " Ueber das Verhaltnis von Skelet und Weich- 

 theilen bei den Madreporen," " Morph. Jahrb.," xii. 



10. Moseley, H. N. — "Notes on Seriatopora, Pocillopora, &c," 



" Quart. Journ. Micr. Sci.," xxii. 



11. Sclater, W. L. — "On a New Madreporarian Coral (Stephano- 



trochus Moseleyanus)" "P. Zool. Soc," 1886. 



EXPLANATION OF PLATES II. and III. 



Illustrating Mr. G. Herbert Fowler's Paper on " The Anatomy of the 

 Madreporaria," III. 



Fig. 1. Transverse section through a small part of the crateriform 

 colony of Turbinaria sp. {vide p. 18). Ab. Abaxial, inner, or 

 ventral surface of the colony. Ax. Axial, outer, or dorsal 

 surface of the colony, a. Oblique section through a polyp 

 cavity, b. Transverse section of a polyp cavity near its 

 orifice, c — c. Similar sections further from the orifices. 

 (Camera lucida.) 



Fig. 2. Diagrammatic transverse section of a polyp of Turbinaria sp. 

 (p. 19). In this and similar diagrams the ectoderm is repre- 

 sented by " blocked " black and white, the mesogloea by a 

 dark line, and the endoderm by a light line, the calcareous 

 skeleton being dotted. The thicker and contorted ectoderm 

 at the upper part of the stomatodreum represents the taller 

 cells, interspersed with plentiful nematocysts, occurring in 

 the neighbourhood of the tentacles, i.e., mouth disc rather 

 than stomatodseum. Twenty-two pairs of mesenteries 

 occur in this polyp, of which eleven are on the right and 

 nine on the left of the " directives." A bit of the external 

 body wall is drawn to show its relations to the echinula- 

 tions. Ab.D. Abaxial directives. Ax.D. Axial directives. 

 St. Stomatodseum. Ed. Ectoderm. Me. Mesogloea. En. 

 Endoderm. (Cam. luc.) 



Fig. 3. Transverse section of a mesentery of Turbinaria sp., bearing 

 an ovum with nucleus, nucleolus, and nucleoleoli. The 

 lengthening of the endoderm cells round the ovum is 

 noticeable. 



