i. internal triangle.
al. anal loop.
Antn-c-sp. Antenodal costal spaces.
Ptn-c-sp. Postnodal costal spaces.
Ptn-r-sp. Postnodal radial spaces.
All cells are named after the vein that bounds them anteriorly and are numbered, if more than one, from base outwardly, as 2M3 = second median 3, etc.
In Plate 3, figure 1, M, in the outer margin between C1 and M2, should be M3: the 3 was accidentally cut out by the engraver.
Plate 1
