SPINAL XERVES OF THE FROG. 128 



8. Braun, A. — " Ueber die Varietaten des plexus lumbo — sacralis von 



Bona.''' Inaug. diss., pp. 1-26. Bonn. 1886. Describes 

 two cases, and investigates varieties in the thickness of the 

 nerves going into the plexus. This paper is in the Library of 

 the Linn. Soc. 



9. Davidoff, M. — " Ueber die Varietaten des Plexus lumbosacralis von 



Salamandra maculosa." Morph. Jahrb. Bd. ix., pp. 401- 

 . 413. Taf. xix. 1884. 



10. Gaupp, E. — "A. Ecker's und K. Wiedersheim's Anatomie des 



Frosches." 1899. pp. 7, 158-9, 169-171, 192-3. Contains 

 short digest of Adolphi's work. 



11. *Goette, A. — Entwick. d. Unke. Leipzig, 1875. Taf. xix. Abnormal 



Sacrum Bombinator. 



12. Hay, 0. P. — "On the Structure and Development of the Vertebral 



Column of Amia." Field Columbian Museum. Zool. Ser. 

 Vol. 1. No. 1. pp. 1-54. PL i.-iii. 1895. Vertebral 

 column of living and extinct Amphibia. 



13. * Howes, G. B. — "On some abnormalities of the Frog's vertebral 



column (B. temporaria)." Anat. Anz. i., p. 277. 1886. 



14. Howes, G. B. — " Notes on the Vertebral Skeleton of a Fire Toad 



and on the Crania of three Babbits." Jour. Anat. and Phys. 

 Vol. xxiv., p. xvi. app. 1890. 1 fig. Bombinator . Abnormal 

 sacrum. 



15. Howes, G. B. — "Notes on Variation and Development of the 



Vertebral and Limb Skeleton of the Amphibia." Proc. 

 Zool. Soc, 1893, pp. 268-278. 14 figs. Discusses sacrum, 

 atlas, and urostyle. 



16. Mivabt, St. George and Clarke, R. — "On the Sacral Plexus and 



Sacral Vertebrae of Lizards and other Vertebrata." Trans. 

 Linn. Soc. Series II., Zoology. Vol. I., pp. 513-532. 

 PI. 66 and 67. 1879. Includes a section on the Sacral 

 Region of Batrachians. 



17. Morgan, C. Lloyd. — " Abnormalities in the Vertebral Column of 



the Common Frog." Nature. Vol. 35, p. 53. 1886. 

 B. temporaria. Abnormal 8th and 9th vertebrae. 



18. Parker, G. H. — " Variations in the Vertebral column of Necturus." 



Anat. Anz. Bd. xi., pp. 711-717. 1896. Abnormal sacra. 

 Does not believe in the intercalation of new vertebrae. 



19. *Portis.— Atti R. Accad. Sci Torino. Vol. xx., p. 1173. 1885. 



More than 9 free vertebrae in some extinct Anura. 



20. *Sasserno. — Atti R. Accad. Sci Torino. Vol. xxiv., p. 703. Abnormal 



sacra in Anura. 



