The plane of the narial rim is oblique to the lateral surface of the maxilla.
"Two New Pelycosaurs from the Lower Permian of Oklahoma"
Richard C. Fox
The asymmetry of the bones too is remarkable, although this is characteristic of all the catodon whales, especially as regards the bones of the anterior narial passages, the left of which is very much larger than the right.
"Natural History of the Mammalia of India and Ceylon"
Robert A. Sterndale