286 MR. 8T. GEORGE MIVART ON ANUROUS BATRACHIANS. [ May 13, 
each other by the tongue being fixed in front as usual (the Engy- 
stomide) or free in front (the Xenorhinide). 
The toothed (or Frog) series may also be similarly divided into 
two sections :—first, those with an imperfect ear, the Bombinatoride; 
secondly, those with a perfect ear. This latter section contains 
more families than any other section of the order, there being three 
families in which the sacral vertebra is not dilated, and four in which 
it is dilated—seven in all. In order, however, to place those families 
in juxtaposition which have most affinity for each other (e.g. the 
Discoglosside next to the Ranide, &c.) I have thought it desirable, 
in the annexed table, to treat the dilatation of the sacral vertebra as 
subordinate to the presence or absence of parotoids. I do not, how- 
ever, consider, as I have already said, the latter character to be infe- 
rior in importance ; but such a way of treating the matter is conve- 
nient in this particular instance. 
Thus the Plectromantide, with parotoids and non-dilated sacral 
vertebra, will come first, then those with parotoids and dilated sacral 
vertebra; first, the Alytide, without digital disks, and then the 
Pelodryadide, with them. 
Of those without parotoids the Hylide have a dilated sacral 
vertebra and digital disks; while undilated sacral vertebra is common 
to the Polypedatide and Ranide, which differ in the presence or 
absence of the disks; after these the Discoglosside, which have the 
sacral vertebra dilated, but are devoid of disks. 
Finally come Pipa and Dactylethra, which thus form a third 
primary division of the Anura, characterized by a highly developed 
tympanum, but no tongue. 
ANURA, 
A. Without mawillary teeth at any time of life, but with a tongue. 
I. Ear imperfect. 
Tongue free in front .............. Rhinophrynide. 
Tongue fixed in front .............. Phryniscide. 
Il. Ear perfect. 
a. Sacral vertebra not dilated ........ Hylapleside. 
3. Sacral vertebra dilated. 
|. SPATOCOIGS, steer So, agen as ... Bufonide. 
2. No parotoids. 
Tongue free in front ...... . Xenorhinide. 
Tongue fixed in front........ Engystomide. 
B. With mawillary teeth at some time of life and with a tongue. 
I.) Har imperfect) i e.0s vedas waeeeee.. Bombinatoide. 
II. Ear perfect. 
a. Parotoids. 
1. Sacral vertebra not dilated .... Plectromantide. 
2. Sacral vertebra dilated. 
NoidieitalsGisks in ok sje ete Alytide. 
Drettalimisks~ 08. 2kG a Seis Pelodryadide. 
