1891.] TADPOLES OF THE EUROPEAN BATRACHIANS. 603 



ocular space not more than twice as broad as the 



distance between the nostrils 13. P. cioltripes. 



b. Tail obtusely pointed, with fine black decussating 

 lines ; an inverted fold on each side of the lip, 

 the upper edge of which bears a long series of 

 teeth; beak white, with black edge. V. Pelodytbs. 



14. P. pimdatus. 



II. Spiraculum median ; anus median ; tail rounded or 

 obtuse at the end ; a papillose edge all round the lip, 

 sometimes narrowly interrupted above ; labial teeth 



in r, series, disposed in two or three rows, at least in 



the second series. 



A. Spiraculum equally distant from the anterior and 



the posterior extremity of the body ; tail at least ~^ 



once and a half the length of the body and three 



and a half or four times as long as deep ; caudal 



crests with a polygonal network of fine black lines... VI. Discoglossus. 



15. B.j^ictus. 



B. Spiraculum nearer the posterior than the anterior 



extremity of tlie body ; tail not more than once and 



a half the length of the body, twice to twice and a 



half as long as deep ; caudal crests with fine black 



decussating lines VII. Bombinator. 



Mouth trigonal 16. B. ignciis. 



Mouth elliptical 17. B . fachypm. 



C. Spiraculum nearer the anterior than the posterior 



extremity of the body ; tail at least once and a half 

 the length of the body, twice and two thirds to 

 thrice and a half as long as deep ; no black network. VIII. Alytbs. 



18. A. ohstetricans ; 19. A. cistemasu. 



With regard to size, the European tadpoles rank as follows : — 



Maximum length 



on record. 



millim. 



1. Pelohates fuscus 175 



2. „ cultripes 120 



3. Rana esculenta Ill 



4. Alytes ohstetricans 90 



5. „ cisternasii 69 



6. Pelodytes punctatua 65 



7. Rana agilis 59 



8. Bombinator igneus 50 



9. Hyla arborea 49 



10. Rana iberica 49 



11. ,, grcBca 48 



12. „ temporaria 46 



13. Bombinator pachypus 45 



14. Bufo viridis 44 



1 5. Rana latastii 44 



16. „ arvalis 43 



1 7. Discoglossus pictus 33 



18. Bufo vulgaris 32 



19. ,, calamita 30 



