1888.J THE CARPUS AND TARSUS OF THE ANURA. 179 



Walterstorff has recently published (37, 38) an exhaustive account 

 of certain fossil frocjs, and of the Palaeobatrachidse in particular. 

 He claims to have discovered a series of connecting-links between 

 the Arcifera {Pelobatulce) and the Aglossa. lie has pointed to the 

 equality in length of the 3rd and 4th digits of the hind limb in 

 certain of his specimens, and his deductions receive additional 

 support from the fact that in some of those the third digit appears 

 to have even exceeded the fourth in length, as we have shown to be 

 the case in the living Pipa. 



V. List of iiuTHORiTiES referred to. 



1. Baur, G. — Beitrage zur Morphogenie des Carpus und Tarsus 



der Vertebraten. 1 Theil. Batrachia. Jena (1888). 



2. Bayer, F. — Ueber das Skelett der Pelobatiden. Abhandl. 



d. kongl. bohmischen Geselischaft, vol. xii. (1883-84), pp. 1- 

 24, German abstract. 



3. Born, G. — Die sechste Zehe der Anuren. Morph. Jahrb. 



vol. i. (1875) pp. 43.5-452. 



4. Born, G. — Zum Carpus und Tarsus der Saurier. Ibid. vol. 



ii. (1876) pp. 1-26. 



5. Born, G. — Ueber des Skelett des Tarsenhockers v. Rana 



fusca und R. arvcdis. Stzb. der naturwiss. Sect, der schle- 

 sischen Gesellsch. fiir vaterliind. Kultur (1879) pp. 232-234. 



6. Born, G.— Nachtrage zu "Carpus und Tarsus." Morph. 



Jahrb. vol. vi. (1880) pp. 49-78. 



7. Boulenger, G. a. — Catalogue of Batrachia Salientia. British 



Museum (1882). 



8. Brandt & Ratzeburg. — Medizinische Zoologie, vol. i. Berlin 



(I82y). 



9. Breyer, F. G.- — Observationes Anat. circa fabricam Rana3 



pipEC. Berol(1811). 



10. Brocchi, M. — Ilecherches sur I'osteologie d'un Batracien 



Anoure provenant du Bresil {Hemiphrachis). Ann. Sci. Nat. 

 ser. 6 (1877), art. 7. 



11. BrUhl, C. B. — Zootoniie aller Thierklassen. Atlas, pi. 30. 

 Wien(l876). 



12. Cope, E. D.^ — Sketch of the primary groups of Batrachia 



Salientia. Nat. Hist. Review, vol. v. (1865) pp. 97-120. 



13. Cope, E. D. — On the Structure and Distribution of the Arci- 

 ferous Anura. Journ. Acad, of Nat. Sci. Philadelphia, vol. 

 vi. (18C6) pp. 67-112. 



14. Cope, E. D. — On the families of the Raniform Anura. Ibid. 



vol. vi. (1867) pp. 189-206. 



15. CuYiER, G. — Recherehes sur les ossemens fossiles. 4"'"^ 

 edit. Tome x. Paris (1836), pp. 302-309. Atlas, pi. 24. 



16. Duces, A. — Recherehes sur I'osteologie et la myologie des 



Batraciens a leurs differens ages. Paris (1834). 



17. EcKER, A. — Die Anatomic des Frosches. Partl. Brunswick 

 (1864). 



