48 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I3I 



is a right maxilla (U. of Wyo. No. 1093) with three little-worn upper 

 molars. The resemblance of these teeth to those in the type of 

 Titanoides primaevus is striking so that no doubt exists as to the 

 identity. The teeth in No. 1093 are slightly smaller in all dimensions, 

 except M^, and are nearly similar in form. Observable differences 

 include a better developed metacone on the molars, and AP shows, 

 in addition to a slightly larger size, the parastyle directed somewhat 

 more laterally in No. 1093, not so forward as in the type. Very slight 

 differences noted are a less developed protoconule on M^ and meta- 

 conule on M^. 



MEASUREMENTS IN MILLIMETERS OF UPPER MOLARS IN SPECIMEN OF 



Titanoides primaevus gidley, u. of wyo. no. 1093 



Length of upper molar series, M^-M' 66.8 



Ml, anteroposterior diameter : transverse diameter * 20.8 : 23.3 



M2, anteroposterior diameter : transverse diameter * 25.3 : 27.9 



Ms, anteroposterior diameter : greatest transverse diameter 20.4 : 34.0 



* Anteroposterior diameters of Mj and Ma taken across outer styles and transverse 

 diameters perpendicular to line between outer styles. Anteroposterior diameter of M3 taken 

 perpendicular to anterior face. 



CAEN0LAMBDA,2i new genus 



Type. — Caenolamhda pattersoni, new species. 



Generic characters. — Skull with elongate cranium, strong, arched 

 sagittal crest, broad frontals, narrow nasals and heavy canines re- 

 sembling the Titanoides group. Upper cheek teeth, though compara- 

 tively small, are anteroposteriorly shortened and transversely broad 

 as in the Barylamhda-Haplolamhda group, but with molars IVP to M^ 

 about equaling one another in size. 



Discussion. — Caenolambda presents a rather unusual combination 

 of characters and does not closely resemble any of the previously de- 

 scribed genera. Nevertheless, in a general way, the skull is apparently 

 more like Titanoides than Barylambda or Haplolambda. This is 

 noticed in the relatively elongate cranium and strong, arched sagittal 

 crest. It resembles the cast of the paratype of "Sparactolamhda" looki 

 in narrowness of the nasals, although the nasal cavity is apparently 

 not so large. As in the latter and the type of Titanoides primaevus 

 the canine is very well developed. The upper cheek teeth, however, 

 are decidedly different. The teeth are distinctly shortened anteropos- 

 teriorly, particularly the lingual portions, and very broad transversely. 

 The external styles at the anterior and posterior angles of the teeth 

 do not project laterally to such an extent and the primary external 

 cusps are somewhat closer to the labial margin of the tooth, so that 



21 From Greek kainos, recent or new, -|- lambda, the Greek letter — named in 

 analogy with Paiitolamhda, Barylambda, Archaeolambda, and others. 



