which when further developed appear outside in the form of 

 "berry." In this latter form you also find them in the 

 crab. From these eggs are hatched some wonderful little 

 creatures of intense activity, resembling nothing so much as 

 the animalculae shown by the microscope in a drop of ditch 

 water. They are as unlike the shellfish they are to become 

 in mature life as a grub is unlike a butterfly, and, curiously 

 enough, they are sessile-eyed. 



I will now go on to the lives of the crustaceans after they 

 have assumed their final shape. They all are much of the 

 same size when extruded from the egg ; but at maturity 

 they vary from the " common Pea-crab " or from " Andrews's 

 Galathea," either of which at its full maturity can be placed 

 on a threepenny bit and leave an ample margin, up to the 

 largest of our lobsters, crabs, and crayfish. When I was 

 learning these matters the late Professor Bell used very 

 kindly to allow me to send to him for identification any 

 specimens about which I had any doubt, and in 1864 I 

 procured from the submerged part of a deep sea buoy 

 specimens of two very tiny crabs, neither of which was 

 more than I inch across the back. One, I thought, I 

 identified as Euryjiome aspera a crab so rare that I dared 

 not mention it on merely my own authority. The other I 

 could not make out at all, so I sent both to Professor 

 Bell. To my extreme delight he told me I had E. 

 aspera in its young, but final, form, but he took all the 

 pride out of me by pronouncing the second specimen to be 

 a young common crab. I mention this to show how 

 tremendously this latter crab increases in size and bulk. 



And as to this question of bulk. The stalk-eyed crusta- 

 ceans are, as we have considered, enveloped in a hard and 

 non-clastic coat of mail. Wc have seen that they increase 

 enormously in size. How then do they grow ? They grow 



