Zoological museum, tring. 
59 
numerable forms of Invertebrata are exhibited, chiefly 
the jointed animals or Arthropoda. These boxes are 
not all finally arranged, but the following points 
may be mentioned as specially interesting. 
Opposite to the fishes we find a great number of 
Crustaceans. 
Of these the King-Crabs (Oigantostraca) occupy a 
very isolated and singular position. The Limulus has 
an enormous carapace, and very long spines projecting 
from the abdomen and carapace, and a long tail, which 
it uses as a prop when moving about. In May and 
June they approach the coast in couples to spawn. 
Among the true Crustaceans we find the weU-known 
Lobster, Crayfish, Prawns, Shrimps, and Crahs, as 
well as the Barnacles. Of more than passing interest 
even to an amateur are the Hermit-Crahs iPaguridae), 
which abound in all seas. They have a very soft 
abdomen, and, aware of their defencelessness, always 
occupy empty shells, which they do not leave again, 
except to change them for larger ones, as they grow. 
In many cases a remarkable symbiosis, or friendship, 
is observed, with a kind of anemone, which seems to 
share the meals of the Crab, and also must necessarily 
be a protection, as it is most distasteful and burning to 
all fish and other enemies. Several species of Hermit- 
Crabs have forsaken the sea and spend most of their 
lives on land ; for example, the genus Cenobita, which 
