Note 350 — LETTER XXX.
Reading edition
This is not, however, universally the case, for the caterpillar of a Geometer described by Reaumur (ii. 363. t. xxix. f. 8.) (G. amatoria) has a pair of fleshy anal horns, terminating, it should seem from his figure, in a minute hook that the animal uses as a forceps; which has at the same time the anal legs, of which indeed these horns seem to be appendages.