50 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I31 



Horizon and locality. — Bison basin Tiffanian, vicinity of saddle lo- 

 cality at south rim of Bison basin, sec. 28, T. 27 N., R. 95 W., Fre- 

 mont, Wyo. 



Specific characters. — Length of skull greater than that of Haplo- 

 lambda qiiinni but less than Titanoides primaevus. Much smaller than 

 Barylambda faberi. Cheek teeth comparatively small. Other charac- 

 ters not distinguished from those discussed above as characterizing 

 the genus. 



Discussion. — Except for a few isolated teeth or tooth fragments 

 which may represent this species, there are no determinal)le materials 

 other than the type. Moreover, the more fragmentary specimens can- 

 not be allocated as between this form and Titanoides primaevus, the 

 latter having been certainly encountered only at the Titanoides lo- 

 cality, at a level believed to be higher stratigraphically than the saddle. 



The skull designated the type of Caenolambda pattersoni is ad- 

 vanced in maturity so that the teeth are rather well worn, with the 

 characters of M^ almost obliterated. Moreover, the sutures are nearly 

 all obscured so that little is revealed of the surface extent of the sepa- 

 rate elements of the skull. This situation was further complicated 

 by the fact that the skull was discovered in a dense limestone nodule 

 and during its preparation much difficulty was experienced determin- 

 ing the actual boundary between bone and matrix. As a result much 

 in the way of important detail cannot be discerned. 



MEASUREMENTS* IN MILLIMETERS OF SKULL, U.S.N.M. NO. 2IO36, 



TYPE SPECIMEN OF CacHolambda pattersoni 



Length of skull from the anterior margin of premaxillae to posterior 



margin of occipital condyles 320. 



Length from anterior margin of canine alveolus to posterior margin 



of occipital condyles 300. 



Distance from posterior margin of palate at posterior narial aperture 



to posterior margin of occipital condyles 170. 



Width across postorbital processes no. 



Width across nasals about midway of length 24. 



Length of upper dentition, C (at alveolus) to M^, incl 135. 



Lengtli of upix;r check tooth series, P' to M^ incl 92. 



Lengtii of upper molar series, M^ to M' 52. 



C, anteroposterior diameter (at alveolus) : greatest transverse diameter 26.0: 16.0 



P', anteroposterior diameter : transverse diameter 13.0 : 19.0 



P', anteroposterior diameter : transverse diameter 13.0 : 23.0 



P*, anteroposterior diameter : transverse diameter 13.5 : 23.5 



M\ anteroposterior diameter : transverse diameter 18.5 : 27.0 



M', anteroposterior diameter : transverse diameter 19.0 : 30.0 



M", anteroposterior diameter : transverse diameter 16.0 : — 



* Measurements are nearly all approximate owing to fracturing and distortion of skull, 

 and teeth are much worn and nearly all slightly damaged at styles. Tooth measurements 

 include styles and are taken parallel to and at right angles to direction of tooth row. 



