(c) . The skin on the right side has been turned back 

 to show the arm developing beneath. Make 

 a drawing of the righb side showing the arm 

 and the leg. 



(d). The arms have broken through to the.exterior. 

 The left projects through the spiracle; the 

 right actually came through the skin. Note 

 that the arm holes are still evident {i. e., the 

 skin has not yet united with that of the arms) . 

 What changes have taken place in the eyes, 

 mouth, and tail crest? Draw the left side. 



(e). Transformation stage. Note vestige of tail and 

 scars of the arm holes. Make a drawing of 

 the left side. 

 (29). Eggs of No. 28. In natvire, two strings are deposited at 



the same time. Make a drawing showing the spiral 



twist of the string. 



REPTILIA 



Identification of species. 



(i). Before identifying this specimen, make a study of the 

 scutellation. Make a much enlarged drawing of the 

 dorsal, lateral, and ventral aspects of the head. Iden- 

 tify and represent the following scutes (scales): 

 frontal (vertical), large and unpaired on the middle of 

 the dorsum of the head between the eyes; the 

 supraoculars, one on each side of the frontal between 

 it and the dorsal margin of the eye; the parietals, 

 a pair of large plates immediately caudad of the 

 frontal and supraociilars ; the prefrontals, a pair of 

 large plates immediately cephalad of the frontal; 

 the internasals, a pair of plates cephalad of the pre- 

 frontals and between the nostrils; the rostral, a mesal 

 plate fitted about the snout; the preorhitals (pre- 

 oculars) , a series of plates forming the cephalic boun- 

 dary of the eye; the postorhitals {postoculars), a series 

 of plates varying in number in different species and 

 f ormiag the caudal boundary of the eye ; ths suborbitals, 

 when present, are continuous with the preorhitals 



