The slaughter of Niobe and her children is the myth depicted here, possibly a Roman adaptation of the frieze on the throne of the cult statue of Zeus at Olympia, by Pheidias.
These are the searchable databases of the Museum of Classical Archaeology. To start searching the cast collection, click on the Casts box above. To start searching the sherd collection, click on the Sherds box above. The sherd and squeeze collections are likely to be of interest only to academic researchers. The squeeze collection can be browsed but not searched at present.