AMBLYSTOMA PUNGTATUM. 21 



PLATE 'L 



Figures 21 to 28 are enlarged 12 diameters. 

 Figure 29 is enlarged 14 diameters. 

 Figure 30 is one-half natural size. 

 Figure 31 is enlarged 100 diameters. 



Figure 21. — View of anterior end of body and head; hi, balancer; 

 these appendages are now becoming more and more 

 slender, and the circulation in them is diminishing; 

 hn. s. the branchial stumps, the branchiae having been 

 cut away ; dl and cU, the iirst and second digit of the 

 anterior limb ; d5, the first rudiment of the third digit. 



Figure 22. — Shows the anterior portion only; be, the balancer which 

 has just been shaken otf by the animal. The branchiae 

 are now fully developed. The digits of the front limb 

 are elongating. 



Figure 23. — A part of the hinder portion of the body ; ce, the cloaca ; 

 pa, the posterior appendage budding out. 



Figure 24. — Distal portion of anterior appendage of same specimen ; 

 dl, d2 and dS, the first, second and third digits. 



Figure 25. — View of cloacal region a little later ; ce, cloaca; the dis- 

 tal part of the posterior appendage is bifurcating, 

 giving rise to the first and second digits, dl and d2. 



Figure 26.— Anterior appendage of the same ; dl, d2 and d-l, the first, 

 second and third digits ; d-i, the rudiment of the fourth. 



Figure 21. — The anterior appendage at a later stage and turned in the 

 opposite direction ; dl, d.2, d-J and d4 the first, second, 

 third and fourth digits. 



Figure 28. — The posterior limb of the same. Letters as before. 



Figure 29. — A portion of one side of the head and neck ; bn, the 

 branchiae which are being resorbed. The appendages 

 of the branchiae have already been resorbed, and these 

 rounded stumps will disappear in the course of three 

 or four days. 



Figure 30. — Represents a bunch of eggs attached to a blade of grass. 

 The double membranes about each egg show very 

 plainly. The bunch from which this figure was made, 

 contained over 100 eggs. It is one-half natural size. 



Figure 31. — Four spermatozoa, enlarged 100 diameters only, b, has 



attached to it a remnant of the mothercell ; c, and d, 



have one end bent round so as to form a loop, which 



condition gives the appearance of the outline of a head. 



6 



