The stomach is beset throughout its length with numerous small, finger-like caecal tubes.
Coe, Caecal tubes (below them the stomach).
That portion of the gut which is formed by the hypoblast, whereas in Hexapod insects the similar caecal tubes are developed from the proctodaeum or in -pushed portion of the gut which is formed from epiblast.
M, The Malpighian or renal caecal diverticula of Scorpio.
Usually each tube is provided with caecal appendages on its proximal portion, and these serve as vesiculae seminales, while the distal portion is enlarged and glandular and secretes the egg-shell.