( 12 ) 



of Zealand, based on borings afld showing that in the West Scheldt 

 occasionally tertiary layers occur. Since it is of course impossible 

 to indicate the precise layer from which the fossil got free, yet it 

 appears that the skull may belong to the tertiary pleiocene. Also in 

 this respect it would correspond to Trichechus Huxleyi. 



The cranial fragment from Antwerp does not belong to Trichechus 

 Huxleyi, since it deviates considerably from the Zealand skull. Hence 

 it must be a new species. It does not seem desirable to establish 

 a new genus for a fragment, showing so much analogy with Tri- 

 chechus. The name of this Trichechid may be, after the spot where 

 it was found : 



Trichechus Antverpiensis. 



The recent walrus skulls from the "Rijks Museum voor Natuurlijke 

 Historie" at Leyden and from the Zoological collections of the University 

 at Utrecht and Amsterdam were placed at my disposal through the 

 kindness of Dr. F. A. Jentink and Profs. A. A. W. Hubrecht and 

 Max Webeu. At Brussels I was enabled by (he kindness of Dr. L. 

 Dollö to study the fossil and recent material of the "Musée royal 

 d'Histoire naturelle de Belgique". Finally I have to thank Prof. 

 Wichmann who lent me tne fossil for description and without whose 

 assistance I should certainly not have succeeded in collecting all 

 the literature. 



FIGURES. 



Figs. 1. 3. 5. Hind view, base and side of the skull of Trichechus Huxleyi. 



Find: opposite Breskens in the West Scheldt. 

 Figs. 2. 4. 6. Hind view, base and side of the skull of' Trichechus Antverpiensis. 



Find: near Antwerp. 



LITERATURE ON FOSSIL TR1CHECH1DS. 



1. 1823. Cuvier. Ossements fossiles 2e éd. Ie partiep. 264, 2epartiep.521. 



2. 1828. Mitchill, Smith and Cooper. Discovery of the fossil Walrus 



in Virginia. Ann. Lycuim of Nat. Hist, of New-York II p. 27 1 . 



3. 1834. R. Harlan. Critical notices of various organic Remains, hitherto 



discovered in North America. Edinb. New. Phil. Journ. XVII 

 p. 360. 



4. 1835. R. Harlan. Physical and medical Researches p. 255. 



5. 1839. H. Ducrotay de Blainville. Ostéographie, II, p 45 et 49. 

 Ü. 1843. Ch. Lyell. Edinb. New. Phil. Journ. p. 187. 



7. 1842— 1S43. Ch. Lyell. Proc. geol. Soc. IV p. 31. 



y. 1844. Ch. Lyell. On the tertiary strata of the Island of Marthas 



Vineyard: Amer. Journ. of Sc. XLVI. p. 319. 



