576 GEOLOGICAL SURVEY OF THE TERRITORIES. 



tuberosity, which forms the lateral border behind it, aud is directed 

 obliquely upward. The apex of each nasal is verticaJly compressed 

 acute, aud is deeply pitted and rugose for muscular or ligamentous 

 attachments. The inferior lateral marginal ridge is contracted, and 

 incloses a concave median space. The tuberosity sinks to the level of 

 the median suture. The posterior part of the nasal rises to the apex of 

 the middle horn-core, forming its inner face. The postero-superior angle 

 of the premaxillary reaches to near the l^ase of the horn, and is not 

 drawn out to a narrow apex as in L. cornutus. The horn is compressed 

 antero-posteriorly at the base ; at the apex obliquely inward and for- 

 ward. The outer face is concave on the lower half; the inner, convex. 

 The posterior face is concave and the anterior convex, when viewed 

 from the side. 



Measurements of nasal hone. 



M. 



■Width of both at tuberosity 0. 124 



Width of both at base of distal cone OGO 



Depth of suture at front of tuberosity 030 



Length of suture, from premaxillary to horn-core 035 



Length of horn-core, (in front,) (6 inches) 150 



Diameter, (externally) OdO 



Diameter of apex 048 



The occipital region is furnished with an enormous transverse crest 

 which extends upward and backward. Its margin is gently convex, 

 and its supero-anterior face concave. The posterior is narrowed by the 

 inferior crest-like margins of the temporal fossce, which extend from the 

 squamosal part of the zygoma and gradually contract,- terminating 

 abruptly in a low knob where it joins the transverse crest. The poste- 

 rior face between the former is divided into two planes by a low vertical 

 ridge, which terminates some distance below the summit. The trans- 

 verse crest is continued in a curve forwards on each side as the superior 

 margin of the temporal fossa. The specimen does not indicate whether 

 these crests supported horns, but they are very stout. 



Measurements of occiput. 



M. 



Elevation from /o7-ame)i mar/nnm 0. 189 



Width between inferior temporal crests 250 



Width of condyles -with foramen 10 



Elevation above internal sinuses at angles 180 



The mastoid tuberosity is short and stout; the mastoid foramen is 

 large and not piercing a crest. The ex-occipital suture is obliterated. 

 The ^^-shaped crest behind the meatus in LoxoIopJiodon cornutus is little 

 marked here. The surface of the bone has various muscnlar impres- 

 sions. The basi-occipital exhibits a low median crest dividing lateral 

 concavities; transverse width at condyles .077 M. The fragments of 

 teeth are too uncharacteristic for specific descrii)tion. Numerous era- • 

 iiial fragments accompany the above, but have not yet been properly 

 placed. 



The atlas is broken ; its cotyloid cavities are rather shallow, and the 

 diapophyses small. Its antero-posterior diameter below at the middle 

 line is .070 ; at base of diapophysis .070. The condyles of the femur 

 present the characters of the group. There is a deep vertical groove on 

 the inner side just above the condyle. The latter approach each other 

 closely on each side of the intercondylar fossa and are flattened on the 

 superior posterior margins. Width across extremities M. .150. 



At a distance of 100 or 200 feet from the above specimen I found 

 portions of the skeleton of a smaller animal, probably a different but 



