1899.] THE MYOLOGT OF THE EDENTATA. 1011 



13. The flexor profundus digitorum has an extra head from the 



extensor CLibiti. There is no palmar sesamoid in it. 



14. The pronator quadratus extends the whole length of the 



forearm. 



15. The supinator longus is usually double. 



16. The supinator brevis is inserted into the lower part of the 

 radius. 



17. The caudo-femoralis is usually distinct. 



18. The adductor cruris (gracilis) is sometimes double. 



19. The semitendinosus may be double, the ischial and caudal 

 heads remaining separate, or either one may alone be 

 present. 



20. The femoral head of the flexor cruris lateralis (biceps) is 

 usually present. 



21. The tenuissimus is present when the last-mentioned head is 

 absent. 



22. The extensor longus digitorum is usually femoral in origin, 



but sometimes tibial. 



23. The extensor brevis digitorum always has a tarsal origin. 



24. The peroneus longus has no femoral head and its tendon 

 crosses the sole. 



25. The gastrocnemius has no fabellee. 



2(i. The flexor brevis digitorum rises from the calcaneum. 



27. The tibialis posticus is double. 



28. The accessorius is present. 



Dastpodid^. 



1. The panniculus is highly specialized for moving the carapace. 



There is no definite sterno-facialis (sphincter colli). 



2. The depressor mandibulse (digastric) is absent or small. 



3. The sterno-maxillaris is present. 



4. The rectus thoracis lateralis is present and deep to the rectus 



ventralis. 



5. The splenius colli is absent. 



6. The rhomboideus has a large occipital origin. 



7. The subclavius is large. 



8. The clavicular deltoid does not unite with the trapezius to 



form a cephalo-humeral muscle. 



9. The coraco-brachialis longus is always present. 



10. The flexor longus cubiti (biceps) may have glenoid and 

 coracoid heads {Dasyp'us), or only glenoid (Tatmia and 

 CMami/dophorus). 



11. The flexor brevis cubiti (brachialis auticus) rises from the neck 



of the humerus. 



12. The extensor cubiti (triceps) has more than one scapular 



head. 



13. The flexor carpi radialis sometimes fails to reach the meta- 

 carpus. 



14. The palmaris longus is indistinct or absent. 



15. The flexor sublimis digitorum has only one or two tendons. 



