PELONEUSTES PHILAHCHUS. 65 



Some approximate dimensions (in centimetres) of this specimen are : — 



Skull (PL IV. fig. 2) : 



Length from basioccipital to tip of snout 59-5 



„ pineal foramen to tip of snout 46'4 



„ external nares to tip of snout 30-5 



Width of snout at premaxillary expansion 6 - 5 



,, „ constriction (approx.) 5 - 5 



Transverse diameter of occipital condyle 4-5 



Vertical diameter of occipital condyle 3*6 



Mandible : 



Extreme length 71 - 



Length of symphysis 24 - 5 



Width at middle of symphysis 6-6 



,, at narrowest part of symphysis 5-7 



„ of articular surface 6 - 5 



Atlas and axis : length (approx.) 6 - 7 



The other vertebrse are too much distorted for it to be possible to make any measure- 

 ments of value. 



E. 3803. Skull and mandible, both in a very good state of preservation, though the skuf. has been 

 somewhat broken. The skull is figured, from the palatal surface, on PL IV. fig. 1, 

 vhile the bones of the occipital and otic regions, which are in an extraordinarily 

 perfect and uncrushed condition, are figured in text-figs. 11 & 12. The inner face 

 of the skull-roof is shown in text-fig. 13. On each side of the upper jaw there are 

 thirty-four teeth, six of which are in the premaxilla. On each side of the mandible 

 (text-figs. 14, A, B ; 27, A) there are forty-one teeth, of which about fifteen are in the 

 symphysial region. 



The following are the approximate dimensions (in centimetres) of this specimen: — 



Skull (PL IV. fig. 1 ; text-figs. 11-13) : 



Length from tip of snout to occipital condyle . (approx.) 59-3 



„ ,, ,, pineal foramen 46-5 



,, „ „ anterior end of the anterior 



interpterygoid vacuity . . . 27'3 



Width of expansion of snout 5*7 



,, constriction of snout . ' 4-S 



Vertical diameter of occipital condyle 8 - 3 



Horizontal diameter of occipital condyle 4-1 



Width of basioccipital between outer angles of ventro-lateral 



(pterygoid) processes 7 - 6 



Length of basioccipital 4-7 



Width of articular surface of quadrate 4 - 7 



Mandible (text-figs. 14, A, B ; 27, A) : 



Extreme length 72-0 



Length of symphysis (approx.) 22-5 



PART II. K 



