155 



Rostrum - forward extension of the skull. 



Snout - nose; frequently synonymous with beak (Fig. 28). 



Symphysis - a line of junction or articulation, for example, where the 

 two premaxillary bones meet at the front of the upper jaw (Fig. 29). 



Total length (or maximum length) - the straight line distance between the 

 tip of the snout and the tip of the tail (pinnipeds) or the notch 

 of the flukes (cetaceans). 



Transverse - a line across the body, from one side to the other. 



Umbilicus - the navel, or depression on the middle of the abdomen 

 indicating the point of attachment of the umbilical cord 

 (Figs. 32, 37). 



Ventral - the under surface (Fig. 28). 



Figure 27. Some baleen whale terms used in the keys. 



.PLATEOFBALEEKI BLOWHOLE SLIT, 



BONNET 

 -OUTER EJ>6E 



{ 



6ALE-EN 



INNER 



EDGE 



w ITH BRISTLES 



HEAD o-f BALEEN WHALE 



THROAT GROOVES 



