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If the principal vein descends on an incline and the cross-vein descends vertically, then a minor triangle is created having one obtuse angle or all three angles acute.

Nay, further, these same miners, if no stringer or cross-vein intersects the main vein so that they can follow it in their workings, even cross-cut through the solid rock of the hangingwall or footwall.

Basilar cross-vein: Odonata; crosses the basilar space.

Trichoptera, the cell between the forks of the radial sector, and separated from the 2d apical cell by a cross-vein.

Discal vein: Lepidoptera; the cross-vein closing the discal or median cell extends from radius 5 to media 1.