160 MEMOIRS OF THE CARNEGIE MUSEUM 
The ungual phalanges are heavy, long, and broad, with apparently no grooves 
anteriorly. The unguals have more similarity to those of the beaver than to those 
of Cynomys or of Aplodontia. Proximally, the unguals have a heavy plantar tuber- 
osity. Distally the phalanges terminate in a sharp, depressed point. The plan- 
tar surface is broad and flat, and is entirely different from that of Cynomys and 
Aplodontia ; it is more nearly similar to that of Geomys. 
MEASUREMENTS. 
Greatest length of scapula including metacromion process..............0022050 -cseec eee eeeeeeeee seen erees 45 mm. 
Greatest width of scapula 16 . 
Greatestuherchtiofispinerofisca pull aresensmcsce ecco ie seeceecicesenciesiatsctine sheet see ises eraser eee eee see eeee 13 e 
Length of acromion process...............-...1.+- sd ehee seat Riles ua os woh Sateen ee stclstieen se else elle oat aecee se eee 12 et 
Antero-posterior diameter of glenoid Cavity...............0.c0.cecceeeee eee cecnee nec eeeeeeceeeseeseeceeeeesees 9 of 
ransversedianietemoferlenold cally eenectesss sree sesse cece secede reise eeeisec eee eater eres na ee nes 5 iN 
Greatestilensthiolwhumerusseeccsesecessecteees es ceeree es eee ca ence eee teeter Rerese etme 41 Re 
Antero-posterior diameter of head of humerus... 9 & 
Transverse diameter of head of HuMerus.............025....0.ceceecee eee eseeeccerececee ser cenereuse ees cesceeees Gh 
Greatest transverse diameter of distal end of humierus....................02-0200ceeeeeceeceeseeeeeceeeeeeee 16 si 
Greatest engthiofaradlussecetseseoterecscese recess cetera roretere acer erissseereccseece ret ercee aero 3215) 
Transverse diameter of head of radius.... He 
Transverse diameter of distal end of radius..............0.0.0.0cc cece eee e cece cee eee eee esse eerereeer sec eee 7 es 
(CERNE MERE, OF WITEES cooconceacenhaq0n00. cen aoocadconuebooDasEqsqGedGeqcded07G00 d0b00 HoH SDasoaEABIAAODJaEecDoaNB0NE 46 & 
Heishtrofolecranonsprocessssntsc.sosetecssceeteereee eee scarce reece ese eaetene sees a ceee eee ee ene 10 a 
Aypproximatellengthvolsmans ssn. siscecn seas cose a iaesesveosieset a act ssecioce ear secon cieecteciasceersscieeeisecieee 43 su 
18 SES) 08 GS2. TVR) Tit oma cbgonddooqdasoo obs Abo 968 nebanNeGanooodd bee sodkNS nSbeds os oun ELadESooDgohSoansondunHSoenboaGeDO ao 8} Me 
airansverse\diameter, ofsuncilonmercc-cersecece cee eects eeascceas-ectecee sees eeceadaceeeeecrereeaeceeeceee sen tO sO mis 
Motallengthroismetacar pall eleeseneeeeeceses eee ea seeese eee teen eee Reee eeeeee eeeecetoeecneieccecsnaces 5 “ 
MotaljlensthrofsmetacarpaleWcresnsresceeeeeereecree ss ceicecre testcase cneceetcescatter see sencerecees ee 
Motalleng th) of metacarpal PV es. e cms sie saws se le celeste nt eelaieise aelee snleelneialseteleeisiemetelessielseisaseets pa uideeless se 
Rotalblengthyotem etacarpalaViccssse esc ee eee ce rere ese ee ee eeee ene eee cee eee és 
Length of ungual of fifth digit... Ke a 
Weng throfsuncualvofsthindidigiteessescatee eee scteeee eer eeceeeeaeee eee eee eeesee eerereee tee eeeees oe 
Length of ungual of second digit 
* These measurements are taken from specimen No. 1204, which is a larger individual than the type. 
Tue Hinp Limes. PI. XVIII. 
The Pelvis. —'The pelvis is well preserved in the type, and presents considerable 
similarity to that of Castor canadensis. The straight fore and aft diameter of the 
ilium and ischium, the heavy ischial tuberosity, and the wide posterior border of the 
thyroid foramen are especially similar in the two genera. 
In Steneofiber fossor, the ium is trihedral throughout its entire length. The 
supra-iliac border is not much expanded. ‘he sacral surface is moderately long, 
and extends farther anteriorly than in Cynomys and Aplodontia. The external 
surface is a concave fossa nearly the entire length of the bone. The ischial border 
