Description: English: Colour drawing of Elysia rufescens used by William Harper Pease in his original description of the species in 1871. Date: 1 January 1871. Source: The Sea Slug Forum: Elysia rufescens
http://www.seaslugforum.net/find/elysrufe. Author: On the Sea Slug Forum page it states that this colour drawing was used by William Harper Pease, who died in 1871, in his description of this species of sea slug.