184 a MEMOIRS OF THE CARNEGIE MUSEUM 
process of the nasals. The anterior narial opening appears to have a greater trans- 
verse than vertical diameter. The nasals are not present in the type. 
Tue MANDIBLE. 
The angle and the posterior part of the mandible are broken off. The fragment 
shows that the horizontal ramus is rather short, which is in keeping with the short 
cranium. ‘The symphysis is long and heavy, inferiorly it terminates in a downward 
projecting process, similar to that in Steneofiber fossor and the recent beavers. ‘The 
alveolar border is nearly parallel with the long axis of the jaw. The base of the 
coronoid process is present and indicates an exceedingly outward pointing direction 
of this process, which naturally corresponds to the widely separated glenoid cavities 
in the skull. The angle, perhaps, had similar characters to that in Aplodontia. 
MEASUREMENTS. 
Greatestilensthiofeskuallerecpcnccesadesecereeocea se eccsrseee eters ttes eeeesece metee teee ees eet res ceee es eecinse 60 mm. 
Greatest width of skull ............ 0002: ceccseeeeeeeseeeeeeenee oe 
Greatest width of occiput at mastoid processes MS 
Greatesthwidthiofsmuzzlesnccrssscraconccsecececcsicecccnsecedseer cect eccce rece e eee ee coerce eee eee ees 14 oe 
Vertical thickness of skull including occipital condyle to top of sagittal crest............... 2626... 19 os 
Vertical thickness of skull including tympanic bulla............0...c0ccccsseeceeececeneceeeeesteneeseueeeens 22 ne 
Vertical thickness of muzzle, approximately...............0:c:secceceeeeceeeeceeeceeueeecuecsateceeeneeseneess 12 oa 
Length of muzzle from zygomatic process to anterior nareS...............02...0ecececeeseee eee eeeeeeeeees 15 or 
Distance frombincisorstOy pz ewan. cacceseweeeeee eccecececseetes ace cote ere eee se cee eee Cena a ee eee eteeeesaes 18 uP 
Distance from and including p*, to and including occipital condyle......................cc000eeeeeeee 39 3 
Greatest width of occipital Condyles...................ceeee ceceeeneccneceeeeeeeeeeceneeeeeeeeeeueccecsseeeaeeess 15 nS 
Greatest vertical thickness of condyles......................sec0eceeeeeeeeeeeee Do ete duisunc eset uncermonteansenaee 4 3 
Greatest antero-posterior diameter of incisor.. 45  “ 
Greatest lateral diameter Of inciSOr......................cceeecseeen esc seeseeceeeecegceeseeneieceesseeceeeeeeeeeeees 5 ee 
Mandible. 
Total antero-posterior diameter of the three grinders...................0c.c0seceeencceeeeeeeeeeeeeeenee esses 10.5 “ 
Total antero-posterior diameter of pz..............ssecseceeeeeeeeen cee es $9099 O99 9000060600" Do=9aGecoGaNEEe900s5 5 & 
Lotalitransverse diameterOlhpara.so-<ccescssnc severe eee sae eet see en ec ee Ee Eee Ee eee AIOE te 
Total antero-posterior diameter Of My................0ccceseeeceoececnecceneesecesceneerennecetenseereseeenerees 2.5 “ 
Hotalitransyerse diametersols my sepeccosccuscdssseaseseseceesescanace meena seccasteeeeeesemoaeee sere eee ae) oe 
Motallantero-posterioridiameter) Of My.-.c1-.--sec-secsesecceaemetncceecmenea senna sonnet aneeceeseecacaanscenaes Ooh 0 
Motalitransyersediameter Olin rececenccesanossce-sccececctecssseccsesancacee ser temee eee sinveeecereneaeetee se ay 0 
Depth of jaw at pz, including process on the Chin................:.ccececeeeceeenecneeeeteecnecueeeeceeeeees 16 Ss 
Depth of jaw at base of process on the Chin...................2.ceeeseeecceeeseeces ser eeeeseeeeceeseeesceueeeaees eps 8 
IDES SHINE Ey EL LL occ0cce0006e30000000000000000090000050C Gbragd000 soD boa BoSdggdaB.dODIEBbASCEBdDoSaDEAbodHODaaDo000KC 10 ee 
Antero-posterior diameter from p; to incisor (approximately)... 11 ug 
Greatestilengthiofitheyjaw-fraementiese..cs. seme eeseset ence sete ace senertnc aceon eee eee eer 27 "9 
