99 



2. M. adductor solus, 0*45 oz. 



Origin ; from f in. behind symphysis pubis, for one inch along the 



ramus of the ischium {vide Pig. 18, a). 

 Insertion ; if the tibia be divided into sixths, the insertion of this, 



the only adductor, is into the 2nd., 3rd, and 4th sixths reckoned 



from the top. 



3. M. pectinceus,- 0*09 oz. 



The origin is shown in Pig. 18, c. 



4. M. iliacus, 0*36 oz. 



Origin ; marked in Pig. 1 8, d. 



Insertion ; the inner condyle of the femur. 



5. M. quadriceps extensor femoris, 1*15 oz. 



Origin ; the origin of the rectus is shown in Pig. 1 8, e. 



6. M. sartorius, 0*15 oz. 



Origin ; shown in Pig. 18,/. 



Insertion ; inner side of the patella, and overlying the rectus femo- 

 ris. 



7. M. tensor vaginm femoris, not recorded. 



Origin ; from the fascia covering the crest of the ilium, and overly- 

 ing the glutceus medius. 

 Insertion ; outer side of the patella. 



8. M. glutceus maximus, 2*34 oz. 



Insertion, into the great trochanter, whole outer side of femur, and 

 top of fibula. 



9. M. glutceus medius, including pyriformis, 0*48 oz. 



Origin ; marked at g, Pig. 18. 



10. M. glutceus minimus, 0*45 oz. 



Origin ; marked at h, Pig. 1 8. 



11. M. agitator caudce, 0*98 oz. 



Origin ; first five caudal vertebras. 

 Insertion ; upper half of the tibia. 



12. M. obturator externus, 1*02 oz. 



13. M. biceps femoris, 0*45 oz. 



Origin ; tuber ischii. 



Insertion ; into the fascia covering the whole outer side of the leg, 

 as in the Lion and other Carnivores ; it is a triangular muscle. 



14. MM. semimembranosus et tendinosus, . 0*35 oz. 



These muscles conjoined are represented by a single muscle, hav- 

 ing its origin from the first caudal vertebra, and its insertion into 

 the lower third of the fibula* 



Before describing the muscles of the leg, it is worth while to sum 

 up the evidence for the assertion made at the commencement of 

 this Paper, that the muscles of the posterior limb in the Seal 

 differ from those of other Carnivores, principally in the shifting 

 of their insertions to lower points on the leg. 



* It is to be observed that this muscle is inserted into the fibula, and not into the 

 tibia. 



