1898.] A5f ATOMY OF PEDETES CArFER. 871 



into two by the obturator nerve (see fig. 4). The gemelli are 

 fused and form one layer deep to the obturator internus tendon. 



The Quadratits Femoris is triangular, with its apex towards the 

 great trochanter. 



The Flexor Cruris Lateralis (Biceps) has only one head, which 

 comes from the tuber ischii. It is inserted into the patella and 

 upper half of the leg. There is no Tenuissimus and no continua- 

 tion of its lower fibres down with the tendo Achillis. 



The Semitendinosus rises by two heads from the tuber ischii and 

 from the anterior caudal vertebrae, but there is no tendinous inter- 

 section where these join. It is inserted deep to the gi-acUis, the 

 lower fibres forming a fascia which helps to ensheath the tendo 

 Achillis and to blend with it. 



The Semimembranosus rises only from the tuber ischii. It is 

 inserted into the lower end of the femur just above the internal 

 condyle, into the postero-internal part of the capsule of the knee- 

 joint, and into the internal tuberosity of the tibia by one continuous 

 insertion. There is no presemimembranosus distinct from this, and 

 I regard Pedetes as an animal in which the semimembranosus and 

 presemimembranosus are inseparable from origin to insertion. 



The Adductor Criiris {Gracilis) is single and is inserted into the 

 cnemial crest and upper third of the anterior border of the tibia. 

 It does not reach so high as the patella. In the greater number 

 of hystricomorphine and myomorphine rodents there are two 

 adductores cruris. 



The Pectineus is a small muscle rising from the ilio-pectmeal 

 line just internal to the insertion of the psoas parvus and being 

 inserted into the second quarter of the femur. It is supplied 

 entirely by the obturator nerve. 



The Adductor anticus {Adductor longus) is that part of the 

 adductor mass which lies ventral to the obturator nerve and is 

 indicated by the point of emergence of the branch to the adductor 

 cruris. It arises from the inner part of the ilio-pectineal line and 

 is inserted into the middle two-fourths of the femur. 



The rest of the Adductor mass {Adductores medius et posticus) 

 rises from both rami of the pubes, from the symphysis, and from 

 the ramus and tuberosity of the ischium. It is inserted into the 

 middle two-fourths of the femur. 



The Quadriceps Extensor Cruris has the usual four heads. 

 The Superjicicdis quadricipitis {Rectus Femoris) has only one head, 

 which probably corresponds to both the straight and reflected 

 heads of human anatomy. 



The Lateralis quadricipitis { Vastus externus) is much larger than 

 the mesialis {V. internus). The Prof imdus quadicipitis {Crureus) 

 rises from the whole length of the shaft of the femur. 



The Tibialis Anticus has no femoral origin. It rises from the 

 upper third of the tibia and is inserted into the rudimentary first 

 metatarsal. 



The Extensor Longus Bigitorum rises as usual from the external 

 condyle of the femur : it divides into a superficial and deep layer ; 



