274 



Origin ; anterior pectineal line of pubis. 

 Insertion ; into the upper half of the linea aspera. 



2nd Adductor, 0-03 oz. 



Origin ; from the posterior edge of the pubis, its middle third. 

 Insertion ; into the middle of the linea aspera. 

 3rd Adductor, 0'05 oz. 



Origin ; from the posterior edge of the pubis, close to the sym- 

 physis. 



Insertion ; into the back of the top of the fibula, with a fascial 

 union with the tendon of the semitendinosus. 



23. M. obturator externus ? 0*13 oz. 



Origin ; from the tuber ischii, the posterior edge of the ischium, 



and the obturator membrane. 

 Insertion ; into an oblique line on the back of the femur, below the 

 insertion of the quadratus femoris. 



24. M. marsupialis externus, 0*07 oz. 



25. M. marsupialis internus, 0*10 oz. 



These two muscles take their origin, respectively, from the outer 



surface of the marsupial bone, and from its inner surface and 

 the last abdominal rib ; and they are inserted by a common 

 tendon into the top of the posterior intertrochanteric line. Their 



action is to rotate the femur directly inwards. 



26. 31. flexor proprius hallucis, 0*02 oz. 



Origin ; from the outer condyle of femur. 

 Insertion ; into the first, second, and third toes. 



27. M. flexor digitorum communis, 0*05 oz. 



Origin ; from the fibula and tibia. 



Insertion ; into the first, second, and third toes. 



28. M. tibialis posticus, 0*06 oz. 



This muscle is inserted into the tarsal ends of the first, second, and 



third metatarsal bones. 



29. M. per onceo- calcaneus, 0*01 oz. 



Origin ; from the lower part of the shaft of the fibula. 

 Insertion ; into the upper surface of the calcaneum. 



Part 2. — Dissection of Arm of Crocodile. 



The muscular anatomy of the anterior limb of the Crocodile presents 

 no such remarkable peculiarities as those I have described in the leg, 

 and therefore a rapid enumeration of its muscles will be sufficient. It 

 is necessary to bear in mind, for the purpose of comparison with the 

 muscles of the leg, that 



The Marsupial bone represents the clavicle ; 

 Pubis, ,, coracoid ; 



,, Ilium, ,, ,, acromion; 



,, Ischium, ,, scapula. 



