THE TRUNK 



cartilages join the manubrial-xiphoid interval (figure 3) . In a mounted 

 skeleton of this genus in the National Museum, with sternum completely 



Figure 26. Panniculus carnosus and cranial continuation of (P) seal (Phoca), 

 (Z) sea-lion (Zalophus). (T) manati (Trichechus) redrawn from 

 Murie), and (N) porpoise (Neomeris). 



ossified, there are but three pairs of ribs extending to this area, and also 

 three pairs in a Trichechus, the first, however, apparently attached to the 



[167] 



