372 " PEOF. ST. GEOKGE MIVAET ON THE 



twenty-fifth vertebrse may be opisthoccelous ; a median subvertebral process may be 

 formed, of bent-down lateral hypapophyses conjoined, as in Plotus; lateral acetabular 

 fossa subtriangular or quadrate, but never enormous in size ; supraacetabular fossa 

 present or absent; always a marked interval between lumbar and caudal vertebrae 

 through non-development of parapophyses ; sacral vertebrse distinct or not so. Pelvis 

 including from fifteen to seventeen vertebrae ; ilia not meeting at an acute angle ; no 

 conspicuous ilio-pectineal processes ; ilia not flattened against the postacetabular verte- 

 brae ; acetabula, preaxiad to the antero-posterior middle of the pelvis ; ischia and ilia 

 largely united postaxially; pelvis more vertically extended behind than in front of 

 acetabula; postacetabular part of pelvis broader transversely than the preacetabular 

 part ; ilio-caudal spine present or absent ; preacetabular parts of ilia meeting in a 

 median dorsal ridge; dorsum of postacetabular part of ilium not high, convex and 

 broad. Sternum twice as long as broad, or else but very little longer than broad; 

 furcula ankylosed or not ; only one lateral xiphoid process on each side. 



DESCRIPTION OF THE PLATES. 



(In Plates LV., LVI., LVII., & LVIII., the following letters have throughout the 



meanings here given.) 



