University of California Publications in Zoology. [Vol..6 



TABLE II. 



AVERAGE VALUES FROM TABLE I. 



These tables and sketches make several interesting- revelations 

 concerning the variation of the species. Probably the most sig- 

 nificant is the fact that in so many of the points examined the 

 variation is clearly correlated with the size of the animal. The 

 two particulars in which this is most positively seen, so far as 

 the tables go, are the number of dorsal languets and the shape of 

 the branchial stigmata. In table I the twenty-five specimens 

 studied are arranged in order of size of the individuals, from 

 largest to smallest. The gradual though very irregular increase 



