o/ Cyclothurus clidactylus. 261 



the latter digit, continued to the root of the ungual phalanx of 

 each toe, being reinforced at the sides of the digit by the ten- 

 dons of the interossei. 



The extensor brevis digitorum was well developed. It arose 

 from the upper and anterior portion of the os calcis, from the 

 anterior part of the astragalus, and from the fibular side of a 

 strong ligament passing from the latter bone to the entocunei- 

 form. It appeared to be divisible into four slips, the inner- 

 most of Avhich was continued into a tendon which pierced the 

 aponeurotic web of the common extensor tendon at the base of 

 the proximal phalanx of the second toe, and then ran along 

 the dorsal aspect to the tip of the hallux. 



The three outer slips seemed to be inserted principally into 

 the bases of the proximal phalanges of the three outer toes, 

 besides being connected with the under surface of the expan- 

 sion of the common extensor tendon. 



The extensor proprius hallucis arose from the lower fourth 

 of the fibula, and became tendinous on reaching the dorsum of 

 the foot. The long slender tendon joined the aponeurotic Aveb 

 of the common extensor tendon at the metacarpal of the second 

 digit. 



A large muscle arose, partly fleshy, partly tendinous at 

 origin, from the whole length of the inferior edge and fibular 

 side of the strigil bone, and, by means of a tendon, from a 

 tubercle on the inferior surface of the astragalus. It had a 

 broad fleshy insertion into the base of the rudimentary hallux 

 (abductor hallucis ?). By means of those fibres which pass to 

 the astragalus, it would seem that the strigil bone could be 

 slightly raised and approximated to the calcaneum. 



From a ligament stretched across the sole at the line of 

 articulation of the first v/ith the second row of tarsal bones, 

 arose a muscle which passed to the fibular side of the base of 

 the rudimentary hallux. Tliis is not improbably the repre- 

 sentative of the adductor hallucis. 



The muscles proper to the fifth digit were as follow : — 



A long fusiform muscle arose from the inferior surface of 

 the OS calcis, and, after passing beneath the flexor accessorius, 

 terminated at the fibular side of the base of the proximal pha- 

 lanx (abductor digiti quinti?). 



Another arose from the outer side of the os calcis, and was 

 inserted into the tubercle at the base of the metacarpal (flexor 

 brevis digiti quinti?). 



A muscle was inserted into the fibular side of the base of 

 the proximal phalanx, which appeared to arise from the tu- 

 bercle of the metacarpal. Is this an interosseous muscle, or 

 is it an anterior segment of the flexor brevis ? 



