340 PEOF. ST. GEOEGE MIVAET ON THE 



The FIFTEENTH VERTEBKA (Plate LVI. figs. 25-28) is like of Pelecanus ; but there is no 

 hypapophysis, only a slight median ridge, which also occurs in the fourteenth vertebra. 

 The preaxial surface of centrum does not look so much ventrad ; and there is no di- 

 stinct articular surface at the ventral part of the outer surface of the pleurapophysial 

 lamella. On each side there is a small foramen in the antero-posterior middle of the 

 body, leading into the centrum from just above the ventral margin of the body. 



CERVICO-DORSAL VERTEBE^E. 



The SIXTEENTH VEETEBBA has the general character of the corresponding one of 

 Pelecanus; but the hypapophysis is still rudimentary. There is no pleurapophysial 

 lamella ; but a sharp pointed process projects ventrad from the ventral surface of the 

 distal end of the transverse process, and may be connected with the parapophyses by a 

 minute osseous spiculum forming a rudimentary pleurapophysial lamella, while imme- 

 diately postaxial to this small ventrally extending process is a subtriangular concave 

 articular surface. The lateral foramen entering the centrum is very conspicuous. 



The SEVENTEENTH VEETEBBA is generally like that of Pelecanus ; but the hypapophysis, 

 though a little larger than hitherto, is still very small. The lateral foramen leading 

 into the centrum is smaller than in the sixteenth vertebra, and but very little larger 

 than in the fifteenth. 



The EIGHTEENTH VEETEBBA has a long rib ending freely, with an unciform process about 

 as long as the length of that part of the rib which is distal to it. 



DOBSAL VERTEBRAE. 



The NINETEENTH, TWENTIETH, and TWENTY-FIBS! have the general characters of the 

 corresponding ones of Pelecanus, except that they are the first three dorsal vertebrae. 



The TWENTY-SECOND VEETEBEA is less completely over-shadowed by the pelvis than 

 in Pelecanus. It has a rib which is attached very slightly to the parapophysis, against 

 which it abuts by its very slender proximal end. The parapophysis is almost on a level 

 with the root of the diapophysis (Plate LX. fig. 3, xxn). 



The TWENTY-THIRD VERTEBRA is similar, and differs from that of Pelecanus in that it 

 has a long and slender rib. 



It forms part of the ankylosed pelvic mass. The diapophysis and parapophysis are 

 here united into a single " transverse process," and receive the slender proximal end of 

 the fifth thoracic rib. 



The TWENTY-FOURTH VERTEBRA is similar, but smaller, more compressed, and with a 

 smaller transverse process. 



THE LUMBAR VERTBER<E. 



The TWENTY-FIFTH, TWENTY-SIXTH, and TWENTY-SEVENTH VERTEBRA resemble the lumbar 

 vertebrae (the twenty-third, twenty-fourth, twenty-fifth, and twenty-sixth) of Pelecanus, 

 except that generally these are only three in number. There are but two presacral fora- 

 mina on each side, enclosed between their distally expanding parapophyses. Sometimes, 



