50 
ROOM x. ridges; also species of Land Tortoises, as the Indian 
Nat. Hist. Tortoise (Test, indicaj and the Radiated Tortoise 
( Test, radiata) ; the American Box Tortoise (Testudo 
clausa); many species of Terrapin (Emys) from 
America and India ; some very young Turtles (Chelo- 
nia) ; and the head of a very large specimen from the 
Indian Ocean. 
In the Windows are placed some large specimens of 
Snakes, as the Indian Rock Snake (Python), a large 
Rattle-Snake (Crotalus), and two Snakes, the Mourn¬ 
ing Snake (Coluber pullatus) and the Crimson-sided 
Snake (Coluber porphyriacus). 
In the Table Cases, in the centre of the room, are 
arranged the General Collection of Radiated Animals. 
The Sea-Eggs are at once known from the Star-Fish 
by their body not being radiately divided, and by its 
being covered with a hard shell, formed of numerous 
small pieces, placed on bands ; the animals also differ 
by the digestive canal being furnished with two distinct 
orifices, placed at some distance from each other. The 
shell is covered with moveable spines, which serve the 
animals as legs to walk with, and also enable them to 
bury themselves in the sand when they are left on the 
beach by the retreating tide ; it is likewise pierced with 
rows of minute pores, through which are emitted small 
tentacula with dilated ends, by which the animal is 
enabled to attach itself to rocks and other marine bodies. 
The Sea-Eggs are divided into several groups, accord¬ 
ing to the shape of the body, and the position of the 
mouth and anal orifice. 
In the first group, Spatangus, (Case No. 1,) the shell 
is nearly heart-shaped, with an oval compressed mouth 
placed in the front part of it on the under side, and the 
other orifice on the hinder margin. The upper part of 
the shell has the pores placed in five short bands, re¬ 
sembling a flower. The shells of this group are thin 
and brittle, and the mouth of the animal, destitute of 
teeth, is often surrounded by a series of tentacula. 
In the second group, the mouth is in the centre of the 
under 
