42 
SURVIVAL, ON LAND AND SEA 
from cone-like shape of their shells (see figs. 11 and 12) and the 
spindle-shaped terebras. Because of their characteristic form 
they are easily recognized. They have poison glands at the 
base of their hollow teeth and their bite is similar to that of 
venomous snakes. They should be left alone. 
Figure 11. — Poisonous Terebras. Length %" to 8". 
In addition to the mollusks, crabs and lobsters are to be found 
in the crevices and among rocks or reefs and rocky shores. 
Included among the crabs in the Pacific and Indian Oceans is a 
large swimming variety that is related to our Chesapeake Bay 
blue crab (they turn red on being cooked). This form is 
distinguished by the paddle-like shape of the last pair of legs. 
