ArcGIS WMS BBOX problem

[CharlieHopper]

Hello,

I'm trying to extract an image from an ArcGIS WMS Service using the BBOX parameter in latitude, longitude format as in:

http://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/$%7Bz%7D/$%7By... 

This request appears to be ignoring the BBOX parameter and returns an image of the whole world. Is there a way to extract a portion of the image using a Latitude/Longitude bounding box with a WMS request?

Thanks,

Charlie