604 MR. G. A. BOULENGER ON THE [NoV. 17, 



But if we compare the maximum length of the tadpole with the 

 maximum length of the adult, we obtain the following order : — 



Maximum length 

 of adult, from 

 suout to vent, 

 millim. 



1. Pelobates fuscus 80 



2. Alytes ohstetricans 50 



3. Pelobates cultripes 85 



4. Alytes cisternasii 40 



5. Pelodytes punctatus 45 



6. Bomhinator igneus 45 



7. Rana esculenta 110 



8. Hyla arborea 50 



9. Bombinator pachypus 50 



10. Rana agilis 75 



11. „ iberica 50 



12. ,, grcBca 50 ? 



13. ,, latastii 65 



14. „ arvalis 7^ 



15. „ tempararia 85 



16. Bufo viridis 85 



17. Biscoglossus pictus 70 



18. Bufo calamita 80 



19. „ vulgaris 150 



1. Rana esculenta, L. (Plate XLV. fig. 1.) 



Length of body once and a half its width, or rather less, about 

 half the length of the tail. Nostrils a little nearer the eyes than to 

 the end of the snout. Eyes on the upper surface of the body, equi- 

 distant from the end of the snout and the spiraculum, or slightly 

 nearer the latter ; the distance between the eyes twice to twice and a 

 half as great as that between the nostrils, and much greater than the 

 width of the mouth. Spiraculum on the left side, directed upwards 

 and backwards, a little nearer the end of the snout than to the anus, 

 visible from above and from below. Anus opening on the right 

 side, close to the lower edge of the subcaudal crest. Tail twice and 

 three fourths to four times as long as deep, acutely pointed ; upper 

 crest convex, a little deeper than the lower, not extending far upon 

 the back ; the depth of the muscular portion, at its base, about half 

 the greatest total depth. 



Beak very broadly edged, with black, sometimes almost entirely 

 black. Sides and lower edge of the lip bordered, with papillse, 

 which usually stand in two rows ; upper lip with a long series of 

 fine teeth, followed, on each side, by a short series ; three series of 

 teeth in the lower lip, the two outer uninterrupted, the third also 

 continuous or narrowly interrupted, the outermost only one half to 

 two thirds as long as the others. 



The muciferous crypts are pretty distinct on the head, where they 



