48 NATURAL HISTORY. [N. ZOOL. GAL- 
viper is the only reptile found in Great Britain possessed of dangerous 
poisonous qualities. 
Cases 9— 19. The Harmless Snakes. 
~ Cases 9 17. The genera allied to Coluber; as the water snakes 
( Tropidonotus ) and the common ring snake of England ; the coral snake 
(Flaps), which is marked with alternate black and red rings; the flat- 
tailed coral snake, which lives in the sea and has a flattened tail ; the 
juggler snakes (Naja), which have the faculty of dilating the skin of the 
neck so as to form a kind of hood over the head; they are found in 
Africa and India, and are used by the native jugglers in their exhibi- 
tions; the Indian species have usually a yellow spot on the back of the 
neck, somewhat resembling a pair of spectacles. These snakes have 
their hinder teeth larger than the rest ; are furnished with a poison tube, 
like the fang of the rattle-snake and vipers. The tree snakes, or coach- 
whip snakes, have very long bodies; they live chiefly on trees; one of 
these is peculiar for its nose being much produced. 
Case 18. The genera allied to the Boa; they are the only snakes 
furnished with the rudiments of legs ; they are not venomous, and kill 
their prey by crushing it between the folds of the body, generally at the 
same time twisting the end of their prehensile tail round a tree or some 
other fixed point, in order to increase their powder ; some come from 
America, some from India, and a few from Africa. 
Case 19. The Sea Snakes, which are peculiar to the seas of Asia 
and New Holland, and are in some degree dangerous, as many of the 
species have small fangs dispersed amongst the true teeth ; some of 
them grow to a very large size ; they sleep on the shores coiled up, and 
are sometimes found asleep on the surface of the calm tropical seas. 
On the lower shelves is the Acrochorde, found in the ditches of the 
rice-fields of India. 
Cases 20—23. The Tortoises and Turtles. 
Case 20. The Land Tortoises, which live on vegetable sub- 
stances. They are used for food ; as the gigantic Indian tortoise, natu- 
ralized at Galapagos, from whence they are procured in large numbers 
for food by the sailors ; and the different species from India, Africa, 
and America, many of which are beautifully varied with yellow. 
Cases 21, 22. The Fresh-water Tortoises, or Terrapins, which 
live on animal food; they are found in the warmer parts of both 
hemispheres, and are eaten by the North Americans and the natives of 
India. Some grow to a large size, as the crocodile or snapping tor- 
toise of America, and the thurgi tortoise of India. On the lower 
shelves of Case 22 are the Chelydce , which differ from the other terra- 
pins in bending their head back under the margin of the shell when at 
rest, and cannot withdraw it into the cavity of the shell like the other 
tortoises. These animals will only take their food while in the water, 
when in confinement. .... 
Case 23. The three-clawed terrapins, which live in the rivers 
of Africa and Asia, and North America ; they are strictly carnivorous, 
and eat their food in water ; they are to be seen in the Ganges preying 
on the human bodies that float down that river. The lower shelves 
