374 ON THE SETEIA AND 
his corrected map, that Horsley makes the Setun- 
tiorum Portus or haven, the mouth of the Ribble, 
the Belisama the Mersey, and Seteia, the estuary 
of the Dee, but as Ptolemy has laid down twenty 
miles of difference of latitude between the two 
latter estuaries, we cannot see the reason of this 
nearer juxta-position of them on such different 
parallels. Besides he places Rigodunum at War- 
rington, whereas this Roman name is almost uni- 
versally applied to Cocctwm on the Ribble, and 
is so marked in Ptolemy’s map. 
In the map accompanying Antonine’s Itinerary, 
this whole outline of the west coast is depicted 
with a nearer likeness to modern geography—all 
the river-mouths are marked open, but without 
any names attached to the several estuaries. The 
rivers inland are traced to their main divisions, 
and there is besides marked a water communi- 
cation between the Dee and the Mersey, nearly 
in the line of the present canal, between Whitby 
and Chester. 
In the map of the Notitia, which was supposed 
to be drawn up in the year 435 A. p., the lines of 
the coast, estuaries, and main branches of the 
several rivers are also generally laid down, nearly 
