MCKHITIIERIUM LYONS!. 
J2l 
lio'. 2 c ; iilso 1*1. X. fiii. 1. Tlio v(‘rtel)r;i i.s fiotired on 1*1. XI. fip'. 4. Middle Kocene. 
o ' o “ <r> 
The diiiien.sions (in centimetres) oi' the inandihle and lower teeth are : — 
Total length 32 
Height of condyle above inferior border 15'3 
Length of molar and prcniolar .scales 17'2 
Length. Width. 
pm.2 2-2 1-6 
pm/i 2-3 2-1 
prn. 4 2‘o 2‘3 
m. 1 2-65 2-45 
m. 2 3'5 3 
m. 3 4-2 3 
M. 8146. 
C. 7867. 
Made in the British Mu 
seam. 
I’laster cast of the above specimen. 
Nearly complete skull of a young individual In which the second incisor and last molar 
are not yet cut. The description of the skull given in this volume is founded mainly 
upon this specimen, which is figured on PI. VIII. and PI. IX. fig. 1. Upper Eocene. 
The approximate dimensions (in centimetres) of this skull are 
Greatest length from end of condyles to tip of snout ... 35 
Length from hinder border of palate to tip of snout .... 21 
„ summit of occiput to tip of snout 32 
Greatest width at zygomatic processes of squamosal .... 22'7 
„ of occipital surface 17'4 
„ of supraoccipital escutcheon 9-7 
Height of occipital surface above /omwm magnum .... 8‘7 
Width between outer angles of condyles 9‘3 
,, of sknll-roof at temporal fossa 6 
„ „ orbits 6'6 
„ of glenoid surface 7 3 
,, of palate between m.\ 3'3 
„ of foramen magnum 4'2 
Length of premolar series 7'3 
The dimensions (in centimetres) of the teeth are : — 
Length. Width. 
prn. 2 2‘7 ' 2 
pm. 3 2’5 2'8 
pm. 4 2'1 2'8 
m. 1 3 2-6 
m. 2 3-2 2-9 
M. 8875. Plaster cast of the above specimen. Made in the Bntish Maseuni. 
M. 9225. Skull, very slightly crushed and nearly complete, with the exception of the zygomatic 
arches : the nasals are well preserved and terminate anteriorly in points which overhang 
the narial opening. The vertical plates of the pterygoids are thick and appear to have 
a descending plate of the alisphenoid fused on their outer face ; there is an alisphenoid 
canal opening anteriorly into a groove running upwards and forw’ards, as in Palceo- 
K 
