54 
STAR-FISH GALLERY. 
and Toads. All these animals live during some period of their 
existence in the water, when they breathe by gills, and are in 
this respect akin to fishes. The comparatively enormous size 
attained by certain tropical species of Frogs and Toads, such as 
the South American , Horned Frog (fig. 26), should be noticed. 
The largest representative of the group is the Giant Salamander 
of Japan and China. 
star-Fish I^- ^ small gallery is called the Star-Fish gallery, from being 
GaUery. specially devoted to Star-Fishes and their allies — the Echino- 
(See Special ^ 
Fig. 26. — The Hokned Frog (Ceratophrys cornutus). 
DERMA; these are arranged systematically in table-cases 1-6, 
and in case 7 there are specimens illustrating the anatomy 
of the skeleton, and models and figures descriptive of the 
remarkable changes undergone by these animals in the course of 
their development. A nearly complete example of a 
Brittle-star (Ophiomastix) may be noticed, and on the tops 
of cases 5 and 6 are examples of Diadema and Echinus. 
In a separate case on the east side of the gallery is 
LvAdia savignei from Mauritius, one of the largest of known 
Star-fishes. The Feather-stars {Comatula) are also members of 
