Lambe was not completely off, though, as the current convention holds that Stegosauria and Ankylosauria make up the clade Thyreophora as the Eurypoda (Scelidosauridae is also included outside Eurypoda but within Thyreophora). Lambe's attention to the detail of the armored scutes probably provided some of the best evidence, in later years, for the partitioning of the Eurypoda into Stegosauria and Ankylosauria, interestingly. I wish I had an exact paper to point to in reference to this change. Alfred Romer's 1956 Osteology of the Reptiles is widely considered, however, to be the definitive text for establishing Ankylosauria as a suborder within Thyreophora (Coombs and Maryanska. He divided the over 200 scutes into 7 major divisions; 1) Large plates; 2) Medium sized variable dimensions; 3) Moderately small keeled; 4) Small rectangular; 5) Small polygonal; 6) Small keelless; and 7) Irregularly shaped ossicles. He also included plates of the scutes, but my favorite plate is of the skull looking from front to back. Check it out:
References for today:
Coombs, W.P. and Maryanska, T. (1990). Ankylosauria. In Weishampel, D. B., Dodson, P., & Osmólska, H. (Eds.). . The Dinosauria. (456-483) Univ of California Press.
Lambe, L. M. (1919). Description of a new genus and species (Panoplosaurus mirus) of armored dinosaur from the Belly River Beds of Alberta. Transactions of the Royal Society of Canada series, 3(13), 39-50.