58 PROCEEDINGS OF THE ACADEMY OF [1890. 



L o w e r m o 1 a r s q u a d r i t u b e r c u 1 a r w i t h d i s t i u c t t r a n s- 

 versec rests; thirdlower molar withoutt bird lobe. 

 T b i 1- d a 11 d f o u r t b u ]) p e r premolars w i t b single i n- 

 t e r n a 1 and paired external cusps. F o ii r t b lower 

 premolar quadritubercular. 



Upper jaw. Tbe incisors decrease in size laterally, forming 

 a series witb tbe small canine, bebind wbicb is tbe rudimentary first 



premolar followed by a diastema. Tbe 

 tbird premolar is tritubercular ; tbe 

 fourtli bas in addition tbe trace of tbe 

 protoconule and is tbus evidently as- 

 suming tbe molar pattern. Tbe outer 

 faces of tbe ])ara- and meta-cones are 

 flattened witb a median cingulum 

 cusp, presenting a resemblance to tbe 

 same aspect of tbe inolnvs of Pachyno- 

 lophus ; only tbe second and tbird 

 molars bave developed tbe bypocone, 

 and tbe crowns are still subtriangular. 

 Lower j a w. Tbe lower median in- 

 cisor is small ; tbe second incisor is 

 Ti.EURAspinornERiuM (?) Au- large and nearly borizontal. Tbe an- 



MONIERI. a, Superior molar series, , . , • i . ,.i, i i i 4.1 



omitting anterior premolar, xj. b, tenor triangle IS Still marked by tbe 

 Inferior molars, omitting two an- persistence of tbe paracoiiid. 



terior premolars, X J .. Late-al and .j^j^^ ^ j^ ^^ ^ j^^^ ^ ^^ ^^,^^^^ 



inferior views of the premaxillary _ _ . 



reirion (reduced). </, Anterior view ittal Crest witb a broad low OCciput 



ofthea.tragalusandca!caneum(re- ^j^^ Spreading sagittal crests. Tbe 

 duced). e. Distal phalanx, associ- . . 



ation somewhat uncertain. mastoid is exposed. Dr. Lemoiue 



describes two small bones between tbe frontals and nasals, 

 also an inter-parietal. Tbe anterior nares are small and ter- 

 minal in position and tbe posterior nares are placed posteriorly. 

 Tbe proportions of tbe cranial and facial regions suggest tbose in 

 Bidelphys. Skeleton. Tbe limbs are ratber sbort. Tbere are 

 two sacral vertebrae (see '84b). Tbe femur bas a third trochanter 

 and pit. Tbe fibula is complete and tbe tibia articulates witb tbe 

 calcaneum ('84b). Tbe astragalus bas a flat trochlea and tbe usual 

 foramen ; the neck is long ; it articulates distally Avith the navicu- 

 lar only. The calcaneum bas tbe usual concave cuboidal facet. 

 Tbe humerus has no condylar foramen. Tbe structure of tbe 

 radius indicates no power of rotation ; tbe ulna has a well-developed 



