( 5 ) 



That the fossil skull belongs to a walrus-like animal, whose skull 

 in general differs only little from recent animals as to strength of deve- 



d'oss-sertion of the base of the tusks of Trichechus Huxleyi. 

 Found near Breskens in the Wist Scheldt. 



lopment, but deviates entirely from them by the shape of the tusks. 

 It is a pity that for comparative anatomy the value of the frag- 

 ment is nil, for it presents many properties of Trichechus, such as 

 the strong crista occipitalis externa, the big mastoid process and the 

 massive bulla ossea still more typically than the recent animals. 



2. Comparison of the skull with already known fossil Trichechids. 



Fossil remains of Trichechids are known from North-America, 

 England and Belgium. Also skulls of Trichechus rosmarus have been 

 described from the subsoil of Paris (17), Hamburg (10) and Cologne 

 (25), but it has been proved that they were carried there by man. 

 The North-American finds seem to belong to the pleistocene and 

 miocene (21). The tertiary skull deviates in the number of molars 

 from Trichechus rosmarus (8) ; the pleistocene remains are identical 

 with Trichechus rosmarus, although De Kay has classed a skull 

 fragment from Accomac County in Virginia under a fossil species 

 Trichechus virginianus. 



The English fossils were first found in the "Red Crag" of Suffolk, 

 where, however, they are in a secondary "Lagerstatre"; probably 

 the} belong to the older pliocene. (19). Later they have also been 

 found in the "Cromer Forest Beds" (32). They are only tusks, 

 distinguished from the tusks of walruses by strong curvature, 



