The distal portions form the muscles of the tentacles.
Bleeding from a vein is of a darker colour; the flow is steady, and the bleeding is from the distal end of the vessel.
The longitudinal system is discontinuous, and is subdivided into proximal, medial and distal portions.
It is almost certain that the distal of these two segments really belongs to the thigh, but the ordinary nomenclature will be used in the present article, as this character is of great importance in discriminating families, and the two segments in question are referred to the trochanter by most systematic writers.
The maxillaries are connected with the distal anterior corner of the quadrate by the thin, splint-like jugal and quadratojugal.