Skull found on Hastings beach

Skull found on Hastings beach

Observation - Skull found on Hastings beach. Description: Found washed up on Hastings beach on Boxing Day. My first thought is that it's a skull, possibly of a fish or eel, possibly a bird but it seems quite large (11cm long). Could it be a bird's hip bone? If it is bone it seems almost translucent and crysta

Found washed up on Hastings beach on Boxing Day. My first thought is that it's a skull, possibly of a fish or eel, possibly a bird but it seems quite large (11cm long). Could it be a bird's hip bone? If it is bone it seems almost translucent and crystalline, could this be an effect of being in salt water for a long time? Any information would be appreciated.