PLEXUS AND SACRAL VERTEBRAE OF LIZARDS. 531 



DESCRIPTION OE THE PLATES. 



Plate LXVI. fig. 1. Lumbo-sacral plexus of Chamaleo vulgaris. 



2. Ditto, Lacerta viridis. 



3. Ditto, Terns teguexin. 



4. Ditto, Grammatophora barbata. 



5. Ditto, Agama colonorum. 



6. Ditto, Triton cristatus. 



7. Ditto, Cat (Felis catus) . 



Plate LXVII. fig. 1. Lumbo-sacral plexus and nerves of Iguana tuberculata. 

 2. Ditto of Monitor arenarius. 



The following lettering applies consecutively to the different figures. 



Nerves. 



1. Spinal nerve, third preaxial to the one giving off the lumbo-sacral nerve (i. e. fifth presacral nerve 



in Iguana, fourth in Monitor) . 



2. Spinal nerve, second preaxial to the one giving off the lumbo-sacral nerve (fourth or third pre- 



sacral). 



3. Branch to abdominal muscles. 



4. Branch continued on into the obturator nerve. 



5. Obturator nerve. 



8. Branch or branches to iliacus. 



7. Other branch or branches to iliacus. 



8. Obturator nerve dividing to supply the pectineus, obturator externus, tibial adductor, adductor 



magnus, and gracilis muscles. 



9. Spinal nerve, next preaxial to that which gives off the lumbo-sacral nerve (third or second pre- 



sacral nerve) . 



10. Its connexion with the obturator nerve. 



11. Preaxial bifurcation of the nerve, the postaxial bifurcation of which is the lumbo-sacral nerve 



(second or first presacral nerve) . 



12. Lumbo-sacral nerve (generally the postaxial bifurcation of either the second or the first presacral 



nerve, but in Salamandra the entire first presacral) . 



13. Continuation of nerve 11 towards the obturator nerve. 



14. Connexion between nerves 11 and 9. 



15. Crural nerve. 



16. Branches to iliacus. 



17. Branch to gluteus medius. 



18. Branch to gluteus maximus. 



19. Branch to rectus femoris. 



20. Branch to crureus. 



21. Spinal nerve intermediate between the spinal nerve giving off the lumbo-sacral nerve and 



the more preaxial of the vertebrae with enlarged transverse processes (either 1st presacral 

 nerve or absent). 



22. Trunk formed by 12 and 21, and going to sciatic nerve, 



23. Branch to obturator internus. 



