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Keywords from Image Description:
. The American Houndfish Mustelus canis. a. Under side of the head of the same. . The Spiny Dogfish Spinax acanthias. a. Under side of the head of the same. . The NYPL b. en The American Houndfish Mustelus canis Under side of the head of the same The Spiny Dogfish Spinax acanthias Under side of the head of the same The Small