Something is amiss
When I went to http://biodiversitylibrary.org/page/1973010#page/161/mode/1up to check out the source document, I could not find the reference to Figure 89 on this or the next page. More puzzling, however, is that the BHL website page above included a reference to the species depicted as "Ichnusa." I could find no such species name (scientific or popular) on the internet, only a beer by that name. Anyone know what BHL meant?
As for the Ichnusa, it is a variety of a Small tortoiseshell butterfly, namely: the Corsican small tortoiseshell (Aglais ichnusa Hübner, 1819).
The animal displayed on this page, Crassicorophium crassicorne is a marine amphipod crustacean, and it is mentioned at the end of the article on the following page, 150, at the bottom.
Sometimes, it isn't entirely clear what the illustration belong to..
by trosesandler scientist
@smj - just to clarify why you are seeing the scientific name Ichnusa on that page. All BHL pages are OCR'd to translate the images of text into actual text for searching. That OCR is then run through the Global Names Recognition and Discovery service http://gnrd.globalnames.org/ to find out if any of the names on the BHL text page match name sources in GNRD. When there's a match it provides an identifier and we store that in BHL to enable scientific name search within BHL and in order to link out to other sources on the web such as the Encyclopedia of Life (EOL). So the BHL VIewer is really only indicating that Page 149 has an illustration and that the text on that page has a scientific name of "Ichnusa" without really saying if there's a correlation between the two. Hope that is helpful.