Never seen this washed up on the beach before.
30 May 2009.
Slaughter Beach, Sussex Co, DE
Dead juveniles washed up at Bald Point state park.
Heard only, not seen. Called several times.
Some kind of manta ray or sting ray
Found it next to the sidewalk in Ash Creek Estuary.
Merostomata is the name given to a grouping of the extinct Eurypterida (sea scorpions) and the Xiphosura (horseshoe crabs). The term was originally used by James Dwight Dana to refer to Xiphosura only, but was emended by Henry Woodward to cover both groups.