328 PEOP. p. 0". PAESONS ON" THE 



8. The supinator longus is generally present. 



9. The pronator quadratus is never attached to more than the 

 lower third of the forearm. 



10. The presemimembranosus is closely connected with the 

 adductor mass, instead of being separate or fused with the 

 semimembranosus. 



11. The gracilis is a single muscle. 



12. The flexor tibialis does not join the flexor fibularis in the 



sole. 



13. The accessorius pedis is present. 



14. The rhomboideus capitis forms a continuous sheet with 

 the other rhomboids. 



15. The rectus ventralis (abdominis) does not decussate with 

 its fellow at its origin from the symphysis pubis. 



The foregoing are not all found in the Sciuromorpha alone, 

 though all are points of distinction between the Sciuromorpha and 

 one or more of the other three suborders. It is only by taking 

 a large number of characters that one can hope to neutralize the 

 efiects of individual variation or to reduce its disturbing influence 

 to a minimum. 



It will be noticed that Anomalurus agrees with the Sciuro- 

 morpha in the following points : — ISTos. 2, 3, 5, 6, 7, 9, 10, 11, 12, 

 13, 14, and 15, but differs from them in Nos. 1, 4, and 8. 



In reviewing the myological characteristics of the Myomorpha 

 it will be evident that in a great many points they resemble the 

 Sciuromorpha. 



The following are characteristics of the Myomorpha : — "! 



1. A certain amount of the masseter always passes through tko 



infraorbital foramen. 



2. The digastric muscles have the sciuro morphine arrange- 



ment. 



3. The transverse mandibular muscle is present. 



4. The omo-hyoid is present. 



5. The omo-trachelian always rises from the atlas. 



6. The subclavius does not usually form a sterno-scapularis. 



7. The coraco-brachialis brevis is seldom present, and the 



three parts of the muscle never occur together. 

 ,8. There are always two heads to the biceps cubiti. 

 ,9. The supinator longus is absent. 



