DEVELOPMENT OF THE COMMON FROG. 103 



of hind legs remained small ; they were translucent and 

 showed no trace of internal structure. 



38. Drawings were made of two tadpoles, the natural 

 size. 



During the last week the tadpoles have eaten large 

 quantities of confervse, fresh supplies of which have been 

 given to them daily. 



Plate XI. 



48th. Before leaving home for ten days, the tadpoles in 

 the large basin were supplied with a quantity of confervse 

 scraped from the sides of the pond ; on my return the 

 whole of it was found to be consumed, and the quantity 

 appeared to have been insufficient. 



48. The tadpoles in the pond were double the size of 

 the largest in the basin ; and several of the latter were 

 comparatively very small. Drawings, of the natural size, 

 were made of one from the pond and of a large and a 

 small one from the basin, showing the difference there 

 may be in size in tadpoles of the same age. The develop- 

 ment of the tadpoles in the pond is no further advanced 

 than that of the others. 



48 (2) . A drawing was made of the mouth of one of the 

 larger tadpoles from the basin, under the microscope with 

 the one-inch object-glass. It showed the brown horny 

 beaks, the upper being the larger and overlapping the 

 lower ; both had their cutting-edges serrated. The upper 

 lip had two rows of comb-like teeth, and the lower had 

 four rows of similar teeth ; the outer row, however, was 

 very small. The lips were white, and were foliated and 

 frilled, and very large compared with the opening of the 

 mouth. 



48 (3) . A drawing was made of the angle between the 

 body and the root of the tail on the right side ; it showed 



