354 



Verzeichnis der besprochenen Polydesmiden: 

 1] Brachydesmus superus Latz, genuinus m. 



2) - - portofinensis Verh. 



3) - - mosellanus Verh. 



4) - - laurorum Verh. 



5) - verhoeffi apuanus Verh. 



6) - - Silv. 



7) - proximus alnorum Verh. 

 8] Polydesmus rupicursor Verh. 



9) - savo7iensis 



10) - platynotus Poe. 



11) - monticola Latz. u. Att. 



12) - holivari Verh. 



13) - cruciator - 



14) - plitvicensis Att. u. Verh. 



15) - edentulus 0. K. genuinus m. 



16) - - bidentatus Verh. 



17) - - vajolettaììus Verh. 



18) - - multidentatus Verh. 



19) Strongylosoma hispanicum Verh. 



20) - bertkaui Verh. 

 17. August 1907. 



2. A Curious Instance of Polymely in the Common Frog. 



By W. AVoodland, King's College, London. 

 (With 2 figures.) 



eingeg. 31. August 1907. 



So far as I can discover from a survey of the relevant literature ^ 

 the polymelous frog described below is unique and hence worth de- 

 scribing. In March of the present year I had occasion to fertilise arti- 

 ficially several thousand eggs of the common frog {Rana temporaìia) 

 for a class in Embryology. Of these some three or four hundred were 

 allowed to attain the fully-formed tadpole stage, and in one of these 

 I observed that four hind legs were present, three being borne on 

 the left side and one on the right (fig. 1). The fact that the vast 

 majority of these tadpoles were normal (no other abnormalities of any 



1 See the papers referred toinBateson's Materials for the Study of Variation, 

 pp. 554, 555; also F. L. Washburn, A Peculiar Toad, Amer. Nat. Vol. XXXIII. 

 1899. p. 139; C. H. Eigenmann and U. 0. Cox, Some Cases of Saltatory Variation, 

 op. cit. Vol. XXXV. 1901. p. 33; R. H. Johnson, Three Polymelous Frogs, t. c. 

 p. 25. 



