/ 



576 GEOLOGICAL SURVEY OF THE TERRITORIES. 



tuberosity, wliicli forms tlie lateral border beliiml it, and is directed 

 obli(]iU'l.v ui)\vnr(l. The a])ex of eacli nasal is vertically compressed 

 acute, and is (leei)ly pitted and rugose for muscular or ligamentous 

 attachments. The inferior lateral marginal ridge is contracted, and 

 incloses a concave median si)ace. The tuberosity sinks to the level of 

 the median suture. The posterior ])art of the nasal rises to the apex of 

 the middle horn-core, forming its inner face. The ])ostero-su[)erior angle 

 of the premaxillary reaches to near the base of the horn, and is not 

 drawn out to a narrow ai)ex as in L. cornutus. The horn is c^ompiessed 

 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 tnbero.sity 0. I'M 



Width of hotli at base of distal cone 0(]0 



Depth of suture at front of t nberosity 0:>0 



Length of sutui'i^, I'roni preniaxilhuy to luiru-core 0155 



Length of horn-core, (iu front,) (G inches) l.'O 



Diameter, (externally) OdO 



Diameter of apex U4d 



The occipital region is furnished with an enormous transverse crest 

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

 and its suiiero-anterior face concave. The i)osterior is narrowed by the 

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

 squamosal part of the zygoma and graduallj" contract, terminating' 

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

 rior \m-x' 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 foramen ma(jn um 0. 180 



Width between inferior temporal crests 2C0 



Widlli of condyles with foramen 1 



Elevatiou 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-occijutal suture is obliterated. 

 The ,Y-shaped crest behind the meatus in Lo.wlophoclon cornutus is little 

 marked here. The surlace of the bone has various muscular impres- 

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

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

 teeth are too unclKiracteristic for specilic descrii)tion. jSTumerous cra- 

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

 placed. 



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

 diapophyses small. Its anteroposterior diameter below at the middle 

 line is .()7() ; at base of diapophysis .070. The condyles of tW femur 

 ]iresent 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 JM. .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 



