I put some labels on this! Not a whole lot different from horse/deer anatomy. Alicorn is the old term for a unicorn horn…well, before MLP got ahold of it.
Hepatus epheliticus, known by various names, including the calico crab (not to be confused with Ovalipes ocellatus) and Dolly Varden crab, is a species of crab. It lives in shallow water in the western Atlantic Ocean from the Chesapeake Bay to the Dominican Republic. It has a 3 in–wide carapace adorned with large red spots with darker outlines.
