REPTILIAN SPERMATOGENESIS 



293 



Spermatogenesis of Sceloporus undidatus var. consobrinus 



The spermatogenesis of this species was carried out to the 

 extent of determining the chromosome complex and the behavior 

 of the sex-chromosome. This small lizard is rather rare around 

 Austin. My material was taken from two males. 



Text figure 1 Sceloporus undulatus var. consobrinus. A. Spermatogonia! 

 plate. B and D. Equatorial plates of the first maturation division. C and E. 

 Late anaphase stages of the first division. 



In text figure 1, A to E, the essential features of the spermato- 

 genesis are shown. Dividing spermatogonia (A) show the typical 

 outer circle of twelve macro-chromosomes, and within this the 

 micro-chromosomes which number about eighteen. A careful 

 examination of the macro-chromosomes shows that we have 

 here essentially the- size relations found in Anolis and Sceloporus 

 spinosus. The 'a,' 'b,' and 'c,' chromosomes are labeled. 

 (In text fig. 1, A the size difference between 'b' and 'c' is not 

 well shown. It is more striking in the next division.) 



