1887 A. M. Marshall & C. H. Hurst v. 58 They open mid-dorsally in the grooves between the segments, and place the cœlom in communication with the exterior.
1908 6 277 Two of the adults have blotches of light sepia on the ventral side and one has Prout's brown mid-dorsally.
1995 C. Nielsen xlvii. 359 Middorsally, the protocoel is filled by the heart.