306 MR PHILIP J. WHITE ON THE GREENLAND SHARK. 



Vpt. Palato-pterygoid cartilage. 

 Pr. Pre-orbital process. 

 Pr". Pre-orbital foramen (upper). 

 P?*'. Pre-orbital foramen (lower). 

 Ps. Pre-spiracular cartilage. 

 R. Rostrum. 

 R//, Ky', R//", R//'". Branchial rays. 



SI, S2, S3. Foramina for 1st, 2nd, and 3rd spinal nerves. 

 Sr. Supra-orbital foramina. 



Tr. Foramen (inner) for trigeminal and abducens nerves and part of facial complex. 

 Tr'. Foramen (outer) for trigeminal and abducens nerves and part of facial complex. 

 V. Vertebral column. 

 V. Arch of first vertebra. 

 Y". Centrum of first vertebra. 

 Yg. Pneumogastric foramen (inner). 

 Yg'. Pneumogastric foramen (outer). 

 Yp. Lateral expansion of centrum of first vertebra. 

 X. Strap of cartilage covering facial canal. 

 Y. Foramen for hyoid artery. 

 Z. Foramen for blood-vessel. 



