CONSTANT DIFFERENTIAL GROWTH-RATIOS 37 



not in any way automatically, and still less mechanically, 

 brought about when the sides of the abdomen reach the 

 legs is shown by Pinnotheres, the pea-crab (Atkins, 1926) 



8 10 12 14- 16 IS 20 22 ZA- 



LtriGTri -Cns, 



Fig. 24. — Relative growth in the teleost fish, Orthopristis. 



The abscissae represent total length. The ordinates represent (above) the length of the head, trunk 

 (body), and tail ; the division between head and trunk is taken at the hind end of the opercular bone, 

 between trunk and tail immediately above, or below, the end of the hindmost median fin ; (below) 

 maximum depth and width of body. 



