SANFORD—-SOMERSET-CAVE RODENTIA. 131 
Oricetus songarus. 
Upper jaw— 
Length. Width, 
JDIESIEITORY oa jonobeshénneHoobon tone cree aocErabeanecareeo eee 0:30 
WWI) ENS STeT AIG's) esioag es aocH SBOE SUES ee RHEE ean eers 0-19 
MGS semen ca secanniat ccs souicniindee yates Sac det eHaROS cane OOD cssveaose 0:05 — 
VIP eee Catster once escccinetaeeccazcle dibinlucssleeaieees O-05+ ...... 0:05— 
WNC (32) Weoilee Bb dooh eps soHOOeSBeB oro ded tn fo ag: Laas parcr ear ceatecee 0-04—...... 0-04 
Lower jaw. 
IDIERIGIINE) us cppddobadosnodabpesbaceHebe aauesaeodneooenacHeende 0:18 
WMMOMIRISerIES Hy ieecbncaecsieerere. Bae Me maatslansbatie nates 0-17 
Nea este eee fase cses ne aeeeneane ses sobabnentalleei scenes OXY cosgosese 0.05 — 
MV errr serch ire tease vies Cradle elon shichistceisierrn seine nay sinnseaelioiuce OUD codooncne 0:05 — 
INURE Ee We Mpiics Pibagtisn west vascedbsbcgevedecad ss meyers wadae (OH 05) ace 6 sey 0:04— 
EXPLANATION OF PLATE. — 
Prare VIII. 
g. Arvicola ratticeps. Upper jaw, lateral aspect. 
. Dentition of the upper jaw, magnified six diameters. 
. Lower jaw, external aspect. 
. The same, internal aspect. 
. Dentition of the lower jaw, magnified six diameters. 
Arvicola Gulielmi, n. s., lower jaw, external aspect. 
. The same, internal aspect. 
. Dentition of the same, magnified six diameters. 
Lemmus norvegicus (var.), lower jaw, external aspect. 
. The same, internal aspect. 
. Dentition of the same, magnified six Fesastians, 
Lemmus torquatus (var.), anterior part of the skull, lateral aspect. 
. Dentition of the same, magnified six diameters, 
Lepus diluvianus, skull, natural size, lateral aspect. 
Cricetus songarus, anterior portion of skull, lateral aspect. 
a. Dentition of the above, magnified six diameters. 
6 6. Lower jaw, external aspect. 
6 c. The same, internal aspect. 
6 d. Dentition of the lower jaw, magnified six diameters. 
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