some Remains of Itodnits. 193 



tlie tliiid and fourth toes in the foot of the beaver is a feature 

 seen also in the feet of many other aquatic mammals, and is 

 a specialization for swimming. From the circumstance that, 

 judging from the navicular, these two digits were less 

 specially favoured in Tro(jontherinm, we n)ay infer that the 

 latter was less aquatic than Castor. 



Since writing the above paragraph 1 have read Owen's 

 account* of some limb-bones referred by him to IVogontheriuni. 

 They included the humerus, femur, tibia and anchylosed 

 fibula, and the calcaneum. The humerus was much larger 

 ])roportionally, the femur much shorter in relation to the tibia, 

 than in Castor. The femur is clearly much less specialized, 

 differing principally in the smaller and more highly placed 

 third trochanter, the rounder and thicker lateral borders of 

 its distal half, and its slighter distal expansion. The tibia is 

 longer and has a shallower posterior groove, and the fibula is 

 more extensively anchylosed with it below. The calcaneum 

 ])resents features analogous to those described iu the navicular. 

 As in the latter the posterior non-articular pait is shorter 

 relatively, the articular part more largely developed; it is 

 also broader, and there are similar difierences in the form aiid 

 curvature of the facettes. It is with satisfaction that I note 

 that Owen inferred " from the femoial modifications that the 

 Trogontlier'nun was less aquatic and a swifter mover upon 

 land than the beaver." 



Sciurus wht'tii, sp. n. 



Many years ago Oswald lleert noticed that some of i]\e 

 fir-cones from the Forest Bed bore marks which aj)])eared to 

 indicate that they had been gnawed by squirrels. 'The only 

 additional, and quite doubtful, evidence of such an animal in 

 the Cromerian fauna which Mr. Newton was able to record in 

 lb82 was that of a humerus in the Green (Collection from 

 Ostend, Norfolk; this bone agrees closely in form with that 

 of IS. vidfjcn-isj and it is not certain whetiier it came from the 

 Forest 13ed or from a recent alluvial deposit. Until the 

 discovery to be described here was made, no fuither trace of a 

 squirrel has been met with in the Forest Bed. A few years 

 ago, when he was collecting from the thin bed known as the 



♦ Owen, Geol. Ma;r. dec. 1, vol. vi. p. 52 (1869). 



1 Newton, " Veitebrata of the Foredt Bed,' Mt-in. Geol. Survey, 1882, 

 p. 92. 



Ann. ct' Mag. S. Hist. Ser. 8. Vol. xiii. 13 



