34 
ZOOLOGY OF THE VOYAGE OF THE BEAGLE. 
appearance of the tympanum, the paucity of palatine teeth, and the total absence 
of an interdigital membrane on the hinder feet. These characters being either 
merely comparative or unimportant, were not considered by Bibron as sufficient 
to warrant a generic separation, and I have followed him in retaining the species 
amongst the Cystignathi. It was first discovered by Messrs. Quoy and Gaimard 
at King George’s Sound, in Australia, where it was also obtained by Mr. Darwin. 
It is a beautiful species ; the back being of a rich brown colour, with a pale 
orange fascia extending along the sides from the eye to the thigh, becoming 
bright orange on the flanks. Thighs and legs banded with rich deep brown and 
bright orange. 
Genus— BORBOROCGETES. Bell 
Lingua omto, postich libera, rotundata; antich subacuminata. Dentes palatini in 
Jasciculis binis plus miniisve obliquis, pone naves posteriores positi. Tympanum 
celatum. Digiti anteriores baud palmati ; posteriores ad basin tantiim cute con- 
nexi. Glandulse cutanese nullce. Sacculi vocales {maris) utrinquh sub lingua 
nascentes. 
The two species on which I have founded this genus approach so nearly to 
some species of Cystignatlius, that it is not without hesitation that I determine on 
considering them as typical of a new generic form. The principal characters on 
which I have founded the distinction are the position of the palatine teeth, the 
form of the tongue, the concealment of the tympanum, the absence of glands and 
pores on the skin, and the connexion of the base of the hinder toes by a rudi- 
mentary palmar membrane. It is true that some of the species of Cystignatlius, 
as that genus is at present constituted, agree with the present form in some or 
other of these particulars ; but upon the whole they are sufficiently distinct ; and 
in fact the genus Cystignatlius, as left by M. Bibron, appears to me to stand in 
need of revision and dismemberment. The species constituting the genus now 
proposed, are however both new. The genus Borboroccetes will probably stand, in 
its natural affinities, between Cystignatlius and Cycloramplius, from the latter of 
which it differs in the situation of the palatine teeth, in the degree to which the 
hinder feet are webbed, and the comparative length of the hinder legs. The 
two latter characters are of importance as indicating a difference of habit ; and 
we find that Cycloramplius has proportionally short hinder limbs, wdth the toes 
