152 Viiiversity of California Publications in Zoology [Vol. 16 



The following table shows the sex ratios noted at various times 

 and places : 



It will be seen that the sex ratio varies greatly but not in such a 

 manner as to be attributable to the date when made. It is quite im- 

 possible for me to explain this upon any grounds other than chance. 

 The final averages in the count of the sexes show them to be of 

 practically even number. 



Much more work should be done upon the spiny lobster in order 

 to make it as well known to us as the true lobster of our Atlantic 

 coast. It is quite important from an economic standpoint that we 

 have the fullest information about this rapidly diminishing form. 



Transmitted November 23, 1915. 



