FEOM THE rOEEST BED OF EAST EUNTON, 



ITi 



at its hinder and outermost corner, the posterior palatine notch is likewise without a 

 median process; the tympanic bullae have the same form; and the basioccipital has a 

 median ridge. 



When viewed from above, the median crest of the Saint-Prest skull is seen to be 

 narrower than that in the Forest Bed specimen, and to extend further forwards before 

 dividing and passing outwards to the postorbital processes ; this, however, is a difference 

 due to age and the development of the masseter muscles. In other respects the two 

 skulls are remarkably alike ; the interparietal is perhaps a little shorter in the Saint- 

 Prest specimen ; but the general form and proportions, as well as the outlines of the 

 bones, agree as closely as could be expected in two skulls of the same species. The 

 parieto-squamosal suture has the same deeply sinuous form, and at its hinder pai't, in 

 both skulls, there is a foramen ; there is also a large foramen on the outside of each 

 squamosal between the auditory meatus and the jugal buttress. 



The backs of these skulls cannot well be compared, as the Forest Bed specimen is 

 somewhat denuded of its prominent parts, and the flatness of this region, in the figures 

 of the Saint-Prest skull, seems to indicate considerable obscurity in the original. 

 However, the general form is the same in both, and the depressions just above the 

 condyles are similar. The foramina seen on each side in the mastoid region are not 

 the same in the two specimens; but as neither of the skulls has the two sides alike, 

 this cannot be of very great importance, and the differences may be entirely due 

 to imperfections, and not to any structural difference between the specimens. 



In a side view the two skulls also agree, in so far as they can be compared, and 

 perhaps the most important feature is their similarity in the non-extension of the 

 maxillary buttress downwards to the alveolar margin. 



6. Measurements. 



Basioccipital between condyles to point between incisors 



„ to one of the hinder molars . . . 



Series of cheek-teeth at alveolar margin . . . 

 Front cheek-tooth to point between incisors 



,, ,, ,, to palatal foramen 



Palatal foramen, length 



„ „ to incisors 



Distance between premolars 



„ ,, hindermost molars 



Brain-case, width at temporal fossa 



„ ,, „ between orbits 



Parietal, length 



„ width of each 



Frontal, length obliquelj- 



„ width of both in front of orbit . . . 

 Premaxillse, width of both in front of maxilla . 



„ „ at incisor alveoli .... 



Height of skull, from palate between 



nasals 



VOL. XIII. — PiVRT IV. No. 2. — April, 1892. 





Beaver 

 from Pens. 



Forest Bed 

 skull. 



Fischer's 

 type. 





m. -135 

 •0475 

 •034 

 •057 

 •019 

 •019 

 •023 

 •0075 

 •022 

 •048 

 •0295 

 •070 

 •021 

 •054 

 •049 

 •037 

 •027 



•052 



m. ^133 

 •042 

 •038 

 •061 

 •015 

 •021 

 •030 

 •004 

 •026 

 •050 

 •0335 

 •056 

 •021 

 •064 

 •052 

 •043 

 •038 



•055 



m. •ISS 

 •046? 

 •044 

 •075 

 •016 

 •021 

 •044 

 •0065 

 •027 

 •050 

 •034? 



•054? 



•059 



































nolars to hinder end of 





2c 



