1864. ] DR. J. E. GRAY ON THE TRIONYCHIDS. 93 
Face of skull very short, flat above; forehead flat, rather concave, 
slightly swollen between the hinder parts of the eyes. The palate 
flat, slightly concave in the middle behind the posterior nostrils, 
The edge of the maxilla nearly flat, with a narrow slightly raised 
edge. 
Fig. 14, 
Heptathyra frenata. 
