Hopson, J. A. (1975). The evolution of cranial display structures in hadrosaurian dinosaurs. Paleobiology, 1(1), 21-43.
Notes: He discusses Hadrosaurinae further, which is less useful for my research. However, some interesting ideas. One of them is that they (the Hadrosaurinae that are not kitosaurs) had soft tissue crests (there is more fossil evidence for this now) and also that their diverticula could inflate these via nasal passages for a visual display structure -- perhaps also achieving sound resonation functionality a la the elephant seal. The narial depression seen in these dinosaurs would seem to enable that as he agrees with Versulys (1936) that the area would be occupied by nasal capsules, their glands, and be ar-filled.
With the mention of the elephant seal, I did do a side excursion of course to look and hear elephant seals:
https://www.youtube.com/watch?v=FpIf6mPZJGA
https://www.pbs.org/newshour/science/elephant-seals-recognize-vocal-rhythms-avoid-bullies
The paper ends with the discussion about how each of the different hadrosaur groups and subgroups may have evolved their differing crests and nasal passages, including speculations on form and function.
And now for computer music interlude, which will eventually tie-in -- some research on raspberry pi:
From Reddit:
https://www.reddit.com/r/diyaudio/comments/ncdmrs/raspberry_pi_for_dsp/
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