PEOF. W. H. FLOWEK ON THE GENUS MESOPLODON. 437 



Fig. 4. Upper surface of cranium of young Mesoplodon hectori, from the specimen in 

 the British Museum. 



m.f, maxillary, p.f, prsemaxillary division of the foramen for the exit of the infra- 

 orbital branch of the second division of the fifth nerve. 



All one fourth of the natural size. 



PLATE LXXII. 



Fig. 1. Side view of cranium of adult Mesoplodon australis, from the specimen in the 

 British Museum. 



Fig. 2. Side view of cranium and mandible of young Mesoplodon grayi, from the speci- 

 men in the Museum of the Royal College of Surgeons. 



Fig. 3. Side view of the rostrum and mandible of adult Mesoplodon haasti, from speci- 

 men in the Museum of the Royal College of Surgeons. 



Fig. 4. Side view of the cranium and mandible of young Mesoploclon hectori, from the 

 specimen in the British Museum. 

 All one fourth of the natural size. 



PLATE LXXIII. 



Fig. 1. Side view of the articulated skeleton of the young Mesoplodon grayi, in the 



Museum of the Royal College of Surgeons. 

 Fig. 2. Sternum of the same. 

 Fig. 3. Upper surface of the vertebral column of adult Mesoplodon australis, from the 



specimen in the British Museum. 

 Fig. 4. Side view of the same. 

 Fig. 5. Sternum of the same. 



[It was intended that these figures should all be reduced to the same scale, viz. -^ ; 

 but by some error figs. 1 and 2 are reduced to about yt, and figs. 3, 4>, and 5 to between 

 ^ and ^g-, giving the appearance of greater relative size to the latter skeleton than 

 it really possesses.] 



