GEOLOGICAL SURVEY OF THE TERRITORIES. 603 



commencement of this description, the R. eximius and T. roulini differ 

 as follows : in H. eximius there is (1) a high sagittal crest which is want- 

 ing in T. roulini, T. maJcujanus, and approximated in T. terrcstris. (2) 

 The crest of the squamosal part of the zygoma is continuous with the 

 lateral occipital crest, which is not the case in existing tapirs. 



Vcrtebrcc. — (1) The arterial canal of the atlas is not isolated in front 

 as in T. roidini, but notches the basis of transverse process. (2) The 

 axis is longer than in T. roulini. (3) The neural spines and especially 

 the metapophyses of the i)osterior dorsal vertebrse are more elevated. 



(4) The end of the Centra of the lumbars are flatter, and more depressed. 



(5) The diapophyses of the same are wider and longer and thinner, and 

 the penultimate articulates with the last by an angular process, which 

 is not the case in T. roulini. 



Sca2)ula. — (1) This bone is equal in size to that of a T. roulini, of con- 

 siderably greater general dimensions, and is hence relatively larger. (2) 

 The spine is not angulate as in that species, has a larger base, and larger 

 elevated margin. (3) The neck is more contracted, and (4) the coracoid 

 is not recurved as in T. roulini. (5) The sinus bounded below by the 

 latter is much shallower, and not bordered above by a recurved hook of 

 the margin. 



Ilumenis. — (1) It is relatively smaller in H. eximius. (2) The internal 

 bicipital ridge of T. roulini is wanting. (3) The external condyle is much 

 shorter, whence its border is nearer its trochlear rib. The radiiis has a 

 narrower head, (1,) the external articular i)laue being shortened. (2) The 

 shaft is wider with a more acute longitudinal lateral ridge medially, and 

 more rounded distal end. The ulna is (1) absolutely nearly as long as 

 in T. roulini, being thus relatively longer. (2) It has three weak, longi- 

 tudinal ridges on a convex outer face ; in T. roulini the external face is 

 divided by a very prominent longitudinal angle from the radial cotylus, 

 which spreads distally, sending one angle to the upper and another to 

 the lower base of the distal epiphysis. 



Carpus. — This part is (1) absolutely and relatively smaller than in T. 

 roulini. (2) The pisiform is more cylindroid distally. (3) The scaphoid 

 is more produced backward on the inner side ; the excavation of the 

 inner side is more continued as a concavity of the outer side of the front. 

 (3) The unciform has an acute tuberosity behind; in T. roulini it is short, 

 vertical, and obtuse. (4) The trapezoides has a shorter, wider, and more 

 swollen external face. (5) The ijisiform is small and convex, instead of 

 beiijg larger and liat. 



The mttacarinUs (1) are absolutely and relatively smaller. (2) The 

 inner (II) has a more oblique phalangeal articulation, which is short 

 above and with the keel prolonged upward, instead of being, as in T. 

 roulini, distal only. 



The 2^clvis is distinguished by the much longer plate of the ilium, 

 whose extremity constitues the crest. (1) The crest is also shorter, and 

 more anterior. In T. roulini this plate does not so much exceed the 

 sacral plate in length. (2) The pubes and ilia are not so horizontal, but 

 meet at nearly a right angle, and (3) the ischiopubic common suture is 

 considerably longer. (4) The obturator foramen is a more elongate 

 oval. 



The femur is very similar to that of T. ro»7/«i, being no smaller in rel- 

 ative size. (1) The great trochanter is wider fore and aft, and with 

 margin more continued on the anterior aspect of the extremity of the 

 shaft. (2) The third trochanter is nearer the middle of the length. (3) 

 The condyle surfaces are continuous with the rotiilar, not isolated as in 

 T. roulini. The latter also (4) lacks the two fossae on the outer margin 



