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Show 1899.] THE MYOLOGY OF THE EDENTATA. 1011 13. The flexor profundus digitorum has an extra head from the extensor cubiti. 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 fabellae. 26. The flexor brevis digitorum rises from the calcaneum. 27. The tibialis posticus is double. 28. The accessorius is present. DASYPODIDCE. 1. The panniculus is highly specialized for moving the carapace. There is no definite sterno-facialis (sphincter colli). 2. The depressor mandibulae (digastric) is absent or small. 3. The sterno-maxillari3 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 (Dasgpus), or ouly glenoid (Tatusia and Ch lamgdophorus). 11. The flexor brevis cubiti (brachialis anticus) 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 metacarpus. 14. The palmaris longus is indistinct or absent. 15. The flexor sublimis digitorum has only one or two tendons. |