22 



GUIDE TO THE COEAL GALLERY. 



High Cases 

 I.-VI. and 

 Table Cases 

 1 and 2 a, b. 



Fig. 3. 



A. Ilalicliondria panicea. Vertical section X 100. Partly diagrammatic. 

 a, oscule ; h, jiorcs ; c, whip chambers. B. Dermal membrane or skin with 

 pores X 100. c. Whip chamber X l,(jOO (after A'osmaer). d. Skeleton 

 spicule X 100. 



