Planorbis (back of sheet) (Fresh Pond, Cambridge, Mass., 7 May 1848), Jacques Burkhardt

Taxonomic classification: animalia--planorbis. Common name: ram's-horn snail. Specimen collection date: 1848-05-07. Dimensions: 10 x 19 cm.. Medium: pencil on paper. Collection: Harvard University. Planorbis (back of sheet) (Fresh Pond, Cambridge, Mass., 7 May 1848)