LIST OF ILLUSTRATIONS. 
x 
PLATE IV. 
No. 
Fig. 42. Arvicola riparius, skull from above. .------------- +----+---------- cmoSnsadan osajc8csc6 1949 
Fig. 43. a Gs skull in profile. ...-...----- ------ +--+ ----2+ -- 2220 cere cee rece eee 1949 
Fig. 44. sf ‘ left jaw, outside ......--------------- ---- 6-- 2-2 eee eee eee eee 1949 
Fig. 45. e skull from below....------2----+ ---+ +--+ 2-2 022s nen en eee eee 1949 
Fig. 46. a skull from above..--.....------------------+------- Bee son, ona 4858 
Fig. 47. iG oe skull in profile.......--.---- ---- ---- +--+ 22-220 see eee eee eee eee 4858 
Fig. 48. rs cs left jaw, outside ...--....----.----------- +--+ -2 22 eee e ee rete eee eee 4858 
Fig. 49. ce =s skull from below..-------- -----+ «+--+ ----+2 2-22 222 een ns eee ee eee 4858 
Fig. 50. “ — townsendi, skull from above...-.. -.---.-----+-+---2 202 cree eee ee eee eee ee 6892 
Fig. 51. ue i skull in profile.....--...-. ---.------ e022 see eee eee tens eens eee eee 6892 
Fig. 52. ee ee left jaw, outside ......---. ------++ +--+ +--+ ++ -- 28 --- 2 eee eee eee 6892 
Fig. 53. as fs skull from below.----..-------------- = SRCOSS Seon Soesad oe aREAE oS 6892 
Fig. 54. “  ganthognathus, skull from above...----------- ---+ ---+-----+-+--2--------+---- | 12018 
Fig. 55. By ce skull in profile... -.------ -2.- .--- --05 222= ones wee ena oes 12118 
Fig. 56. ub cs IGP ve CULTS G Ggse reps ooese0 baeo seers soresoL Bee as seecs0b 50s 12118 
Fig. 57. a sf Sa lae gees Wh eaoemieces cose code Heoo Sond sgoags sooecorieds abases 12118 
PLATE VY. 
Fig. 58. Arvicola austerus, skull from above-..---.-----.------ ---- 0-2 22+ eeee eee eee eee eee 1862 
Fig. 59. ute ee Skcull’an profile. .nsces.s—-( a2 essai ase a= eae ae eee DS 
Fig. 60. He a Evy WOU SUGGS ase neces ase oe ee cane sec eesa doesn aa ss2o Se6o cen 1862 
HipsOlee a ze skull from below..----------.---- Jenveuensise@ aces sasecle=eSeee eee 1862 
Fig. 62. se ss Sie bitin vO Ghngsoee posscocete Seasss cee. Sobecn cencoo 2Ssn50 252-55 948 
Fig. 63. ge qld i Ens secocn Gags cos Seu Seber Aececag weonS Tames essence asonoc 948 
Fig. 64. as ae left jaw, outside.....-...-- oi, Saisie etc Se we eres Save See eee 948 
Fig. 65. se ® pknllitront DelOW=-seeisoe eae tele ee eee ee eee eee 948 
Fig. 66. ESS cumtars WRU ATOMS DOVO=)= alae aie a) aera) etna i= fe eer eel 12169 
Fig. 67. bs < Pevllbrba AHS 40 Basa peceOosOnse HSceonSn anSRcobosSes onion pipette ners 12169 
Fig. 68. fe a efusjaNy, OUtSIGe) = ese ace seets a = morals <lel=t clalce Sea ee een 12169 
Fig. 69. as s skall from’ below: 22 «<< -:.2<--..itjooe.ct spears e seer ee eee 12169 
Fig. 70. i, _ ynnelorum, SKULL +fromaANOVES .<.-~ <22\<2<' > secicte =a ssc) eeie eee pp eee eice 1930 
Fig. 71. Ww ‘ skcullhin | profile 22sec seam actee =e sociein se) nee tee ee eee 1930 
Fig. 72. M3 bs Deftiy aw, OUtsides cece sel soc cis loses = lsc eer ome e eee ae ete 1930 
Fig. 73. if ee snl ifromy belo Wyre <= = (sa — alas aise eee a ema et eee 1930 
hig. 74. synapromys coopers; skull from abovel..-- s-- -<=-26 a-esoee eee epee eae eeieeeeneeets 6915 
Fig. 75. ae cs Skul in profile) lacie <ne sas =f oalee ie setae ee ee 6915 
Fig. 76. oa sf left jaw, outside: << .:: <---/ sapere conse Bacispe esese eee eae eee eee 6915 
Fig. 77. a cs skull from! below, =<. =." cnt <2 stick ssepele osteo tae ele teers 6915 
Note.—The numbers of the right-hand column are those of the specimens figured. 
