Co H 



Figure 145. Diagrammatic sketch of the structure of two baleen plates of a Rorqual separated 

 by gum. B -= upper jaw-bone {palate) ; C = connective tissue of palate ; E ^ epithelium; 

 L = lamella with P = papillae covered with epithelium; De = dead epithelial cells in the 

 hollow part of horn tube; W = wall of two adjoining horn tubes; // = hollow part of horn 

 tube; Co = cortical layer, Bal == baleen consisting of tubes and cortical layer; G = gum; 

 T = region where thickness of cortical layer is determined. {W. L. van Utrecht.) 



