Owen R (1837) A description of the cranium of the Toxodon platensis, a gigantic extinct mammiferous species, referrible by its dentition to the Rodentia, but with affinities to Pachydermata and the herbivorous Cetacea.
Longest overall COLLECTIVENESS / CORRECTIVENESS, MEDDLESOMENESS / METTLESOMENESS, and SLUGGISHNESSES / SLUTTISHNESSES (14 letters); longest with no doubled letters BARBARIZATION / MARMARIZATION (13 letters); longest with three substitutions MAMMIFEROUS / PAPPIFEROUS (11 letters); longest in a set of three or more words DINGLEDANGLE / JINGLE JANGLE / TINGLETANGLE (12 letters).
The language is especially typical of protoscientific and academic discourses in that Prichard generously borrows much of it from an earlier tome, Martin's Natural History of Mammiferous Animals