18/2. J MR. A. SANDEKS ON LIOLEPIS BELLI. 1/9 



inserted by a flat tendon into both sides of the base of the first 

 phalanx of the hallux, being perforated by the tendon of the perforans ; 

 the second is attached by a slender tendon to the side of the base of 

 the first phalanx of the second digit ; the third divides, and, after 

 the passage of the perforans, again unites, and is inserted into the 

 base of the second phalanx of the same digit ; the fourth also divides, 

 and is inserted into the base of the third phalanx of the third digit ; 

 it gives off a slender tendon to the base of the second phalanx of the 

 same digit, and also receives the tendon of a small muscular slip from 

 the broad tendon of the perforans ; the fifth slip goes to the base of 

 the first phalanx of the fifth digit without being perforated. I think 

 it probable that the above-described muscle includes the outer head 

 of the gastrocnemius as well as the flexor perforatus. 



Popliteus (fig. 14) arises from the fibula for ahout one sixth of 

 its length ; distad of the head the fibres spread out and are inserted 

 into the posterior surface of the tibia for about one-third of its extent. 



Flexor digitorum perforans (figs. 8, 1 4, & 15) arises by two heads — 

 one from the outer condyle of the femur, the other from the head 

 and rather more than the proximal third of the posterior surface of 

 the femur ; at the point of junction the muscle is faced with a ten- 

 dinous expansion, which, soon becoming a broad tendon, passes over 

 the tarsus and occupies the sole of the foot ; on the peroneal side it 

 is attached to the peronseus primus. This tendon divides into five 

 separate slips ; that for the fifth digit is given off hy itself and passes 

 through a groove of the cuboid to be inserted into the base of the 

 ultimate phalanx of the fifth digit : the remaining four tendons are 

 inserted into the terminal phalanges of the first four digits ; those of 

 the third and fourth give off slips for each of the successive phalan- 

 ges. A little conical muscle is given off between the second and third 

 tendons, ending in a slender tendon which joins the perforatus of the 

 third digit ; from the superficial surface of the tendons of the second, 

 third, and fourth digits another and larger muscular slip is derived, 

 which joins the longest of the three tendons mentioned above as coming 

 from the superficial tendinous expansion of the perforatus muscle ; in 

 addition a muscle arises from the anterior concave surface of the 

 cuboid, and, being inserted into the deeper surface of the tendon of 

 flie perforans in the sole, is further prolonged by means of three 

 slips to be inserted into the bases of the first phalanges of the second, 

 third, and fourth digits. 



Tibialis posticus (fig. 15) arises from the distal two thirds of the 

 flexor surface of the fibula, and ends in a broad tendon, which, 

 being closely bound down to the astragalo-calcaneum, following the 

 curves of its surface, is finally inserted into the row of bones in front 

 of that bone. Belonging to this muscle is a muscular slip which goes 

 from the peroneal side of the astragalo-calcaneum to be inserted into 

 the projecting articular process on the flexor surface of the cuboid:* 

 this muscle was marked peronseus tertius in Gecko ; but I find that 

 Bojanus in his ' Anatome Testudinis Europsese,' names its hoinologue 

 as above, although it has no more to do with the tibia in that animal 

 than in this. 



