1 12 DK. THOMAS ALCOCK ON THE 



Plate XIX. 



73 (4). Au enlarged drawing was made of the liver and 

 intestine removed from the tadpole represented on Plate 

 XVIII. 73 (3). The intestine was large, long, and uni- 

 form in diameter throughout. 



74 (5). A frog-like tadpole was examined. The gill- 

 opening had its usual shape and size, not yet altered by 

 the left fore limb pushing against it. A drawing was 

 made of its mouth under the microscope with the two-inch 

 object-glass. The lips were smaller than they are shown 

 in previous drawings. The upper lip, from its position, 

 showed only the one outer long row of teeth, with another 

 row behind it on one side. The lower lip, being everted, 

 showed all the teeth upon it clearly : the rows were much 

 degenerated ; one had disappeared entirely, and the other 

 three were reduced to imperfect rows on each side. The 

 teeth were irregular in length, and most of them small 

 and as if falling out. The brown part of the beaks was 

 only half the width of previous specimens, the serrations 

 on their cutting-edges, however, were strongly marked. 



75. A less-advanced tadpole was taken, and a drawing 

 made of its mouth. It showed the lips and teeth within, 

 fully developed and of the characteristic tadpole-form. 



77. A tadpole in which the body had assumed the frog- 

 form was examined. The gill-opening at the leftside was 

 large ; and a toe of the left fore limb protruded through it. 

 There was no appearance in the skin of the right side of a 

 perforation, though it was baggy and thin over the right 

 limb. An enlarged drawing of the ventral surface was 

 made. 



77 (2). On cutting away the skin from the ventral 

 surface, the left fore limb was found with the palm turned 

 outwards, and it was seen that the inner toe had pressed 



