1882.] 93 ■ [Hinckley. 



reached the limit of their size and average about 58 millim. from, 

 the end of the muzzle to that of the tail. 



June 2. Found some of the tadpoles in the shallow water near 

 the shore with one arm thrown out, usually the right. The cuta- 

 neous folds extending from behind the eye to the posterior 

 extremity of the body are visible, and within the spots of dark 

 brown on head and back, granulations have appeared. The black 

 net work is disappearing as the skin develops in texture and 

 color to that of the perfect frog. Sections of the toothed edges 

 of the horny jaws are beginning to flake off, and the fringe to 

 separate. 



June 3. Many tadpoles have both arms free. The nictitating 

 membrane is partly developed for half the distance along the tissue 

 bounding the lower semicircle of the eye. A whitish stripe has ap- 

 peared above the mouth on each side near the middle of the muzzle 

 continuing backward till it meets and forms an elbow with that 

 described May 31. The soft parts of the mouth are beginning 

 to be resorbed. Some of the tadpoles have shed both jaws and 

 fringes. The order and rapidity of the loss of these organs varies 

 in different individuals. The tail has become faded in color and 

 the thin edges are fast becoming resorbed. No food appears to 

 be taken now. 



The tadpoles are at the edge of the shore partly out of water : 

 they are extremly shy, and on being alarmed, hurry away to bury 

 themselves in the mud at the bottom of the pond. The tail has 

 apparently lost its muscular energy. 



June 4. The nictitating membrane is fully developed in all the 

 tadpoles examined. The tail is rapidly disappearing and legs 

 increasing in size. The head is losing its bloated fullness and 

 assuming the shape of that of the young frog. By this change, the 

 whitish stripes, at first elbow-shaped, are gradually brought into line 

 above the edge of the upper jaw. The soft parts of the mouth 

 are nearly resorbed, leaving that feature a small aperture. The 

 dark brown vitta each side the head including the lower half of 

 the eye, has appeared. The skin is in process of shedding, by 

 some entire, arms excepted, by others in fragments. 



June 2. The gape of the mouth has widened and the jaws are 

 slowly opened and closed as if the tadpole were gasping. A few 



