596 GEOLOGICAL SURVEY OF THE TERRITORIES. 



sive, and tlio posterior border of the latter extends backward with a 

 slight obliquity. 



3Ieasurements. 



M. 



EIcTation of sagittal crest above foramen magnum 0. 045 



V/i(Uh of bifurcatioH of crest behind OolJ 



V/idth of occiput beliiud meatus auditorius 070 



"Width betweeu aud iuchisive of occipital condyles 046 



Width tciuporal fossa at meatus 050 



Vi'idth meatus auditorius 012 



Width coiulyle of uumdible 032 



Depth of ranuis behind - 095 



lu further illustration of the species I add measurements of teeth, 

 &c., from another specimen : 



Ilcastircments. 



M. 



Length of last two superior molars 0. 041 



Length of last 019 



Width of last 022 



Length of inferior molar series 095 



Length of premokirs *.... 040 



Length of last molar 021 



Width of last molar 013 



Depth I'amus at first true molar 040 



Vertehrcv. — The atlas is deeply incised anteriorly above. It is rather 

 short, and its traverse processes are liat, thin, about as long as broad, 

 aud with regular convex distal margin. The arterial foramen issues 

 some distance above and within the notch wliich marks the anterior 

 base of the transverse process. It enters at the notch at the posterior 

 base. The neural arch is quite convex, and its anterior margin is ob- 

 tuselj' rounded. The axis is near the same length, and bears a promi- 

 nent and elongate laminate neural spine. Its diaparapophysis is narrow 

 aud overlaps the parapophysis beliind it three-quarters of an inch ; it is 

 pierced for the cervical artery. The centra of the third and fourth cer- 

 vicals are about equal in length to that of the axis, but t\xe remaining 

 ones shorten successively to the seventh, which maintains a length 

 somewhat greater than its width. The parapophyses of these, except 

 the seventh, are flattened, and have considerable antero-posterior extent, 

 their extremities overlapping. A short and rather narrow and stout 

 diapophysis is present on the sixth cervical ; on the seventh it is larger, 

 especially ex])anded antero-posteriorly at the base and truncate. There 

 is no parapophysis. The fourth, fifth, sixth, and seventh have strongly 

 opisthocoelian centra; that of the third is injured. 



Measurements. 



M. 



Length of the cervical series 0. 175 



Length of atlas, between articular faces 04(5 



Length of base transverse process 035 



Length of transverse process 020 



Diameter neural canal in front 021 



Diameter of anterior expanse 050 



Diameter of total expanse 099 



Length axis along basis neural arch 021 



Elevation crest (rectangular) from posterior zygapophysis 036 



Length parapophysis of lifth cervical on margin . 051 



Extent zygapophyses of Jifth cervical on margin 048 



Expanse zygapophyses of lifth cervical on margin behind 044 



Elevation neural spine of C. 6 056 



Elevation neural spine of C. 7 075 



Length cen trum ))clow' of C. 7 028 



Diameter of cui), about 032 



