Figure 5 in REVIEW How the discovery of oligochaete regeneration during the Enlightenment was pivotal to the advancement of annelid research

Figure 5. Body wall of the earthworm as sketched in Spallanzani's laboratory notebooks (Spallanzani, 2003). A, dorsal dissection showing the inner ventral side of body wall after removal of the gut, nerve cord, blood vessels and peritoneum: here, the 'veil' of circular muscles and the underlying longitudinal muscles would be 'a continuous fabric' if they were not interrupted by the four series of ventral chaetae. Such fabric in the 'ephippium' (= clitellum) (rxmo) could not be seen clearly. B, ventral dissection showing, after removal of the gut and other organs, the inner dorsal side of the body wall, with middorsal coelomic pores (cccc) and right dorsolateral chaetae (ou). 'Here the musculature has roughly the same structure as in the belly example.' C, dorsal dissection showing, after removal of the gut, the sinuous ventral vessel (rs) and its intraseptal lateral branches (ce).