222 



CALIFORNIA ACADEMY OF SCIENCES [Proc. 4th Ser. 



Very interesting from the standpoint of scale variation are 

 the following counts showing, in each group, — first, the counts 

 for the adult female and then those for the well-developed 

 embryos taken from her. In the case of No. S4427 the series is 

 not complete, for only six of the twenty-one embryos of this 

 brood could be counted. 



