Hi again Steve :)
Here are some questions pertaining to the images you posted in this thread.
I was expecting to see the arms more symmetrical about their radial axis.
In the book by Ellis, a roughly triangular arm cross section was mentioned, with some flatening on the oral face. Is this description consistant with what you have seen?
Related to the above question, is the cross-sectional shape of an arm roughly constant throughout the arm's length, or does it become more symmetrical with distance from the base?
Does the cross-sectional shape of the tentacles become more cylindrical a short distance from the arm crown?
Also, is there noticable flattening along the oral surface where the tentacle's "clip" together?
The buccal membrane appears to be very loose and almost baggy.
Has it just relaxed post-mortem, or did it have this looseness when the animal was alive?
How large is the beak with respect to the arm crown width?
Is the buccal lappet a thickening in the buccal connective where it merges with the membrane around the beak?
Is the buccal bulb visible behind the buccal membrane, or does it just provide underlying shape and support?
I'm under the impression that the buccal connectives and lappets in a ring around the beak, and originating from each arm, would have an appearance like a rather baggy eight armed starfish.
Is this correct, or am I off the mark here?
Thanks again for all your time and effort on this, 8)