Raja egg case.

Raja egg case.

Observation - Raja egg case. - UK and Ireland. Description: Thoughts please on this egg case, one of 3 similar looking cases found on a short stretch of shoreline yesterday. They look quite similar but in the last pic the one on the left is noticably shorter. This observation relates primarily to the first 2 pics.

Thoughts please on this egg case, one of 3 similar looking cases found on a short stretch of shoreline yesterday. They look quite similar but in the last pic the one on the left is noticably shorter. This observation relates primarily to the first 2 pics. Using this key(http://www.sharktrust.org/shared/downloads/great_eggcase_hunt/eggcase_id_key.pdf) I have once again arrived at Raja undulata(size+very rough edges on present keels). If this is undulata I have mis IDed some others whcih are quite different. I'm confused now. They look like Raja clavata also but the rough edges! Help please. All 3 already steeped overnight.