10 CATALOGUE OF AMPHIBIA. 
Synopsis of Orders. 
A. Nostrils enclosed in a bony case ; the internal nostrils opening 
into the middle of the palate—TRrirongs. 
Order I. Barracuta. 
Gill well developed, vanishing in adult age. Adult with four 
limbs. | 
Order II. Psruposavuria. 
Gill rudimentary or internal. Body with four legs. 
Order III. Psrupopuip1a. 
Gill rudimentary or internal. Body cylindrical. Legs none. 
B. Nostrils not enclosed in a bony case ; the internal nostrils opening 
between the lips and the bones of the palate.—S1RENEs. 
Order IV. Psrvuporcuruyas. 
Gill internal. External skin scaly. 
Order V. Meantta. 4 
Gill well developed, retained throughout life. Skin naked. 
Or they may be divided according to the structure of the skull, 
and arranged thus: 7 
Subclass I. LacerTINI.—Skull formed of separate bones. Gills 
of the young (and, rarely, of the adult animal) well de- 
veloped and exposed. Skin naked. 
Order V. Mzantta. 
Gill permanent. Internal nostrils in inner edge of lip. 
Order I. Batracuta. 
Gill deciduous. Nostrils in a bony case, internal nostril 
in palate. 
Subclass Il. [curuyop1.— Skull solid, the bones united together. 
Gills enclosed under skin, often early deciduous. Neck 
with brachial holes. Skin with embedded scales, Body 
elongate, tailed. 
~ Order II. Psreuposavurta. 
Internal nostril in palate. Body depressed. Legs four. 
Scales minute, embedded. 
