467 



Percentage. 



1. Posterior muscles of hip joint, 29-6 



2. Anterior muscles of hip joint, 28 -6 



3. Extensors of knee joint, 31-9 



4. Flexors of knee joint, 9*9 



100-0 



The first three groups of muscles are here of nearly equal force, 

 while the fourth is about a third of each of the first three. 



No. II. — On the Muscles of some of the smaller Monkeys of the Genera 

 Cercopithecus and Macacus. 



The first monkey whose muscular anatomy I shall describe was a 

 female, of the genus Cercopithecus, which died in the Zoological Gardens 

 of Dublin, in 1860. 



The dissection of this animal gave me the following results : — • 



Table II Physical data. Cercopithecus (female). 



(a) Body and Viscera. 



Grains. Grains. 



1. Body, 34,390 4. Spleen, 85 



2. Brain, 921 5. Kidneys, 299 



3. Liver, 1422 6. Heart, , . 210 



(h) Muscula/r System. 



Grains. 



1. Psoas magnus, 145 



2. Psoas parvus, 45 



3. Iliacus, 70 



'•''rdTc"aS:'}("«'-P-^H) 419 



5. Lumbo caudalis, 165 



(arises from (1 — 5) lumbar vertebrae, and is inserted into 

 upper. third of tail.) 



6. Longissimus dorsi (spliced into last), — 



7. Glutaei and pyriformis, 638 



8. Quadriceps extensor feraoris, 628 



9. Biceps, semimembranosus, semitendinosus, and gracilis,. . 697 



10. Adductores femoris, 478 



11. Trapezius, 90 



*12. Accessory slip from the semicircular ridge of the occiput 



to the superior posterior angle of the scapula, 15 



13. Rhomboidei, 35 



14. Latissimus dorsi, 219 



(attached to triceps). 



*15. Levator anguli scapulae, , 30 



(part of the serratus magnus, attached to the transverse 

 process of 2 — 7 cervical vertebrae. ) 

 *16. Levator acromio-trachelius of Cuvier? (from transverse 

 spine of first vertebra to anterior third of the spine of 



the scapula), 23 



17. Sterno-cleido-mastoid, 50 



18. Pectorales, 224 



