Freshwater pearl mussel Freshwater pearl mussel The freshwater pearl mussel ("Margaritifera margaritifera") is an endangered species of freshwater mussel, an aquatic bivalve mollusc in the family Margaritiferidae. Although the name "freshwater pearl mussel" is often used for this species, other freshwater mussel species can also create pearls and some can also be used as a source of mother of pearl. In fact, most cultured pearls today come from "Hyriopsis" species in Asia, or "Amblema" species in North America, both members of the related family Unionidae; pearls are also found within species in the genus "Unio". The interior of the shell of "Margaritifera margaritifera"
The Pearl of Death and kills him, after which Holmes kills the Creeper, before the police finally arrive. Holmes smashes the final bust and recovers the pearl "with the blood of five more victims on it". Universal Studios attempted to capitalise on Rondo Hatton's effective portrayal of the Hoxton Creeper, casting him in two more (unrelated) films as "the Creeper": "House of Horrors" (filmed in 1945, but not released until 1946, after Hatton's death) and "The Brute Man" (1946, also released posthumously). The Pearl of Death The Pearl of Death is a 1944 Sherlock Holmes film starring Basil Rathbone as Holmes and Nigel Bruce