274 



MESSRS. B. C. A. AVIXDLE AXD F. G. PAIISOXS OX [Nov. 3, 



always an arbitrary proceeding to settle whether a muscle is 

 divisible or not. In the following animals no natural division 

 was made out -.—Hippopotamus (1), Pig (4, 11), Peccary (14), 

 Ohevrotain (20, 21, 22), Deer (25, 26), Elk (30), Ox (35), Sheep 

 (42, 46), and Duiker-bok (54). A fairly distinct adductor longus, on 

 the other hand, was found in the Giraffe (33), Harnessed Antelope 

 (55), Tapir (62), Horse (63, 65, 67), Ehinoceros (70), Hyrax (74, 

 75, 78) (see text-fig. 26), and Elephant (81, 85). We have not 

 been able to satisfy ourselves of a single instance of the presence 

 of an adductor brevis, for the muscle which is called by this name 

 in the veterinary books is clearly the homologue of the human 

 adductor longus. The adductor longus, when it is distinct, rises 

 close to the anterior part of the symphysis, while the insertion is 

 into the shaft of the feinur, usually in its middle third. The rest 

 of the adductor mass rises from the whole length of the subpubic 

 ramus and is inserted into the lower half or two-thii-ds of the 

 femur. The whole of the adductor mass is always supplied by 

 the obturator nerve. 



Text-fig. 26. 



Muscles of inner side of Thigh of HjTax. 



P.s. Psoas. 

 Pect. Pectineus. 

 O.E. Obturator cxternus. 

 A.M. Adductor mass. 

 O.N. Obturator nerve. 

 Gr. Gracilis. 

 Gt.Sc.N. Great sciatic nerve. 

 S.M. Semimembranosus. 



P.S.M. Presemimembranosus. 

 Q.F. Quadratus femoris. 

 C.F. Femoro-coccj'geus. 



Bi. Biceps. 

 S.T. Semitendinosus. 

 I.L.Lig. Internal lateral ligament, 

 H.S. Ham-string. 



Gracilis {Adductor cruris). — This is a very constant muscle 

 among the TJngulata ; it rises as usual from the whole length of 

 the symphysis and runs down as a single broad sheet to the usual 

 insertion at the upper part of the inner surface of the tibia. Its 

 tendon of insertion is generally more or less directly fused with 



