INSERTION.--The long slender tendon enters the anterior aperture of the distal foramen, passes through the intertrochlear canal, emerges from the terminal foramen, and attaches to the medial surface of the proximal end of the first phalanx of digit IV. INNERVATION.--The superficial peroneal branch of the peroneal nerve sends a twig into the proximal part of the muscle. INDIVIDUAL VARIATION.--None of significance in any of the three species studied. =_M. Lumbricalis_=, Fig. 19F _T. pallidicinctus_ GENERAL DESCRIPTION AND RELATIONS.--Small, thin, and strap-shaped; on mid-posterior surface of distal end of tarsometatarsus deep to tendon of M. flexor digitorum longus; belly partly fleshy and partly elastic connective tissue. ORIGIN.--The muscle arises from the deep (anterior) surface of the tendon of M. flexor digitorum longus a short distance proximal to the trifurcation of the latter. INSERTION.--The muscle attaches to the proximal end of the subarticular cartilage ventral to the trochlea for digit III. INNERVATION.--A long but extremely small twig arises from the paraperoneal branch of the tibial nerve a short distance distal to the hypotarsus and extends distally along the mid-posterior surface of the tarsometatarsus (parallel to a larger nonmuscular branch) and enters the deep surface distal to the middle. It was possible to follow this twig in only two legs; it was presumably destroyed in the course of dissection in the others. INDIVIDUAL VARIATION.--In some cases, the "muscle" appears grossly to be entirely connective tissue, although a distinct entity. _T. cupido_ INDIVIDUAL VARIATION.--In some cases, the "muscle" appears grossly to be entirely connective tissue. The innervation was found in only one leg, in which the twig arises more distally than in _T. pallidicinctus_. _P. p. jamesi_ The innervation was not found. =_M. Abductor Digiti IV_=, Fig. 19F _T. pallidicinctus_ GENERAL DESCRIPTION AND RELATIONS.--Slender and elongate; on posterior surface of tarsometatarsus lateral to midline; in contact with M. flexor hallucis brevis in midline. ORIGIN.--The origin is fleshy from the posterior surface of the tarsometatarsus lateral to the midline beginning near the proximal end (lateral to the hypotarsus) and ending at the level of the first metatarsal. INSERTION.--The slender tendon, which begins along the lateral edge of the distal part of the belly, passes through a retinaculum on the posterolateral surface of the tarsometatarsus immediately above the outer trochlea and attaches to the lateral surface of the proximal end of the first phalanx of digit IV. INNERVATION.--The paraperoneal branch of the tibial nerve gives one or two twigs to the proximal part of the muscle. INDIVIDUAL VARIATION.--None of significance in any of the three species studied. =_M. Flexor Hallucis Brevis_=, Fig. 19F _T. pallidicinctus_