Delphinus Deductor or Bottlenosed whale of Shetland. Delphinus Bidens; or two toothed dolphin

Monochrome lithograph of two dolphins. The top dolphin, facing right, is labeled, "Delphinus Deductor, or Bottlenosed Whale of Shetland." The lower dolphin, facing left, is labeled "Delphinus Bidens; or Two Toothed Dolphin." Below this is printed, "Friedel, Lith. 24 Greek Street, Soho."