484 



SCHULTE, SEI WHALE. 



straight save for two slight convexities near the midline where the thyrohyoidei insert. The 

 greatest sagittal extent is 8 mm.; the transverse distance between the tips of the greater coruna 



is 29 mm. The stylohyals are cylindrical at 

 their attachment to the otic capsule. They 

 extend ventrad, mesad and rostrad to the 

 vicinity of the lesser coruna of the hyoid. 

 Here their extremities are somewhat com- 

 t pressed from side to side. They are carti- 



Fig. 7. Hyoid. 1, Stylohyal. 2, Stylohyal ligament. 3, Basio- l a gi noU S in their whole extent, 

 keratic muscle. 4, Omohyoid. 5, Sternohyoid. 6, Thyrohyoid. 



7, Geniogiossus. Vertebra; : In form the vertebrae corre- 



spond already quite closely to those of the 



adult. The tubercles which serve for muscular attachment are but feebly developed and the 

 surfaces are without muscular rugosities, conformably to their cartilaginous condition, only the 

 centra as yet being possessed of ossification centres. The vertebral formula is C. 7, T. 13, L. 

 -C. 35. 



In view of the differential growth of the spine, which is an important factor in determin- 

 ing the form of the thorax and abdomen, a topic upon which Miiller has made most interesting 

 observations, the following measurements of the length of the bodies of the vertebrae are given. 

 They are taken from a medisection f the spine and do not correspond exactly to the length of 

 the ventral faces of the centra which are somewhat shorter, the vertebrae of the lumbar and 

 caudal series being biconvex, and the disks biconcave. In the cervical and thoracic regions the 

 centra are nearly flat. 



Measurements of the lengths of the vertebral centra. 



