CONDYLAETHEA. 501 



indicating the elevation at which the head was held. The neural canal is 

 large. 



Another specimen, or set of specimens of equal size, found together, 

 furnish three cervical, seven dorsal, seven lumbar, the sacrum, and three 

 caudal vertebme. These are accompanied by mandibular rami of three in- 

 dividuals of identical dimensions. The first peculiarity observable in these 

 vertebrae is the more than usually increased size of the lumbars. Were not 

 the intermediate grades present, the dorsals and lumbars might be supposed 

 to belong to different animals. The centra of the dorsals are depressed and 

 a very little opisthocoel; their inferior surface is regularl}' rounded trans- 

 versely, and a little concave anteroposteriorly. Tlie anterior lumbars are 

 similar, but larger. The posterior lumbars are not elongate, as in Phenaco- 

 dus and Hyracotherium, but have the same proportions as the dorsals. They 

 are depressed, and are strongly keeled below. The sacrum includes only 

 three vertebrae, whose centra are much depressed. The diapophyses pos- 

 terior to the first, form a continuous ledge interrupted only by the interver- 

 tebral foramina. The proximal caudal vertebral centra are as stout as those 

 of the dorsal vertebrae and indicate a tail, stout at the base. 



In the following measurements all the vertebrae measured are from the 



lot above described. 



Measurements of vertehrw. 



M. 



Length of axis without odontoid 016 



Expanse of axis at atlautal facets 019 



Diameters posterior face centrum \ ' „„ 



( transverse 0095 



S posterior^ ^"■t''=^l - 008 



Diameters centrum of a cervical < < transverse 010 



( anteroposterior 009 



Height of neural arch 007 



Expanse of postzygapophyses 019 



Uosteriorly^^^"^"*^! 0063 



Diameters of an anterior dorsal < < transverse 0085 



( anteroposterior 009 



Uosteriorly^^'-^tical 006 



Diameters of a posterior dorsal < c transverse 0095 



( anteroposterior 010 



^ posteriorly ^ ^«'-"'=''l ••" 006 



Diameters of an anterior lumbar < {transverse 012 



V anteroposterior Oil 



. . 1 < vertical 008 



, posteriorly I 

 Diameters median lumbar \ I transverse 015 



anteroposterior 012 



