Which two types of spaniels were prominent in the 19th century before the official English Springer Spaniel split?

Answer

Norfolk or Shropshire Spaniels

Prior to the formal establishment and recognition of the English Springer Spaniel as a distinct breed in 1902 by The Kennel Club in Britain, the general classification of 'land spaniel' covered several distinct types. During the 19th century, dogs specifically known as Norfolk Spaniels or Shropshire Spaniels were frequently encountered. It was the selective breeding practices initiated by figures like the Duke of Norfolk that began to formalize the split: smaller specimens bred for hunting woodcock evolved into Cocker Spaniels, while the longer-legged dogs whose purpose was to spring game earned the Springer name.

Which two types of spaniels were prominent in the 19th century before the official English Springer Spaniel split?
Dogbreedspaniel